Mail setup and server verification

I do technical support for an ISP and set up Mail accounts on a regular basis. Out of curiousity and seeing this on a regular basis, I'm wondering why when setting up the POP and SMTP servers in Mail, it takes so long to verify the server names. It should literally take a matter of seconds to verify if the server is alive. I'm wondering, technically, what processes it's performing that requires it to take so long.
Thanks for any info you can provide!

I also do tech support for an ISP and have similar problems.
Its painfully slow to the point where I'd rather refer a customer to use our webmail product then take 10-20 minutes configuring mac Mail due to unheard of delays in verifying server settings.
Microsoft Outlook does verifications as well and manages to send a test message and recieve it in under 10 seconds.
Has anyone spoken to Apple Support and got a resolution to this yet? I don't have a Mac so I don't have Apple Support abilities.

Similar Messages

Mail quota and server issue

I keep getting one of two messages all of a sudden.
Connection Failed
There maybe a problem with the mail server or network. Check the settings for account "*%[email protected]" or try again.
The server error encountered was: The connection to the server "mail.mac.com" on port 993 timed out.
Or I get a message saying that I am at 99% of mail quota. What do either of these mean?

I was aware that you have a .Mac account based on the information you provided in your original post.
My question was/is, how are you accessing your .Mac account with the Mail application on your Mac - the account type - .Mac, IMAP or POP?
The default account type for a .Mac account with the Mail application is a .Mac type account which is really an IMAP account and behaves in the same way.
You can access a .Mac account as a .Mac type, IMAP or POP account with the Mail application and as an IMAP or POP account with another email client such as the Mail application on your Mac or on a Windows PC.
Very few (no others that I'm aware of) email account providers include/support such a choice of account types. The majority support a single account type - IMAP or POP with POP being the most common.
With a POP account, you have the option to remove messages from the server when downloaded by an email client such as the Mail application. There is no such option when accessing an IMAP account with an email client such as Mail. A .Mac type account or IMAP account received messages remain on the server until deleted from the account's Inbox mailbox or moved from the account's Inbox mailbox to a mailbox stored locally on your hard drive. Transferring a message from a server stored mailbox to a user created "On My Mac" location mailbox with Mail (which is stored locally on your hard drive) saves the transferred message locally on your hard drive and removes the message from the server at the same time.
The same doesn't apply to a POP account which is the reason for my question regarding the account type.
Go to Mail > Preferences > Accounts and under the Account Information tab for your .Mac account preferences will show the account type at the top.
You can raise the amount of server storage space allocated for email messages or remove messages from the server to get rid if the error message and back under your server storage limit.

Mail setup and .mac authentication

Baffled… I have been trying to setup my Mail account. I have an active .Mac account which I can access via the internet, so I know it works. I am trying to use Mail as my automatic mail for sending Aperture photos and iWeb announcements.
In going through the setup procedures in Mail I enter all the required information and the application tries to authenticate my .Mac account… it spins and spins… then an error message is received indicating “failure to connect to .Mac”. I have verified my settings with a friend who uses the same ISP, Mail and .Mac and all our settings are the same.
Is this a keychain issue, do I need to reset permissions?
Why can I access my .Mac account through Safari yet the computer can’t do it automatically?
Thanks for anyone’s assistance.

So you get mail from your .Mac account not via IMAP,
but via POP3? Or what do you mean by "as for IMAP I
am not using that"?
And no, I did not talk about pinging the server
(which just sends ICMP echo requests), but about
trying to connect to the server using telnet. That's
a real big difference.
I only get mail via the web ~ Safari ~ Yahoo... .mac mail can be received and used onlt as a web application, Mial does not connect via .mac.
The problem is .Mac authentifcation when setting up a new Mail account, error message says can not verify/connect to .Mac server, yet I can access .Mac via the internet.
IMAP ~ in my system preferences for Accounts/Advanced I do not sync to any IMAP mailbox and the greyed out port is 143 nad SSL is not checked.
Terminal ~ yes it logged in, sorry if I used the wrong term "ping"... so yes it did connect.

Mail Alias and Server Settings

HI!
1. Since MobileMe arrived, none of my alias' show up in the Mail Application. Any ideas?
2. Since MobileMe arrived, my POP accounts won't work. The Mail Application is not letting the other servers get beyond "offline" status so I can't sen mail from these accounts inside of the Mail Application. Any ideas? -Tim, Clarksville, MD

Hi ejmmbrady.
Go to Apple Menu > System Preferences > Network, choose the network interface used to connect to Internet from the Show popup menu and try disabling the SOCKS Proxy in the Proxies section if it’s enabled.
While you’re at it, choose Network Port Configurations from the Show popup menu, and make sure that the configuration used to connect to Internet appears at the top of the list. Leave checked (enabled) only the port configuration needed to connect to Internet and Built-in Ethernet (in that order if not the same), uncheck (disable) the rest of network port configurations and see whether that helps — if it doesn’t, turn ON again the ones you want enabled.

Exchange Mail Setup and Public Folders

V1.01 effected some changes in how the iPhone interacts with an Exchange server. Unfortunately, in my case, they were not positive changes.
In V1.00 the iPhone would create three folders - Inbox, Deleted Items, and Sent Items in the local mailbox. It would ignore most other folders created on the Exchange server such as Calendar, Notes, Spam, and Public folders to name a few.
In V1.01 the iPhone now processes all the folders on the Exchange server. If I have twenty folders on my Exchange account, all those folders appear on my iPhone. Okay, that is acceptable. However ALL Public folders are now being downloaded to the iPhone as well. NOT okay!
I now have hundreds of public folders sitting on my iPhone that I do not want there. After discussing this with some IT guys, the finger seems to be pointing at a broken implementation of IMAP on the iPhone, specifically its inability to define subscriptions - delecting or deselcting folders for populating locally on the iPhone.
I hope this issue can be addressed, and of course true direct push email implemented for Exchange email accounts.

Hi Paul,
I replied to a post from you in another thread. It's easy to miss though, so here's what I said:
"You should tell mail2web that there is an option in Exchange to hide public folders from IMAP clients. I'm an IT manager at a large software company with 50% of our users on Macs. We turned on the option to hide public folders from IMAP clients a while ago, long before the iPhone. It's worked very well and continues to work for iPhone people (like me!).
There was no reason for us to make public folders viewable via IMAP, so hopefully the same will be true for mail2web."
I'm actually really glad that Apple made this change. I want to see most of the folders at the inbox level in Exchange and with the Exchange switch turned on to hide public folders, there's no downside.
Regards,
fh

How do I get the mail icon and server onto my daughters laptop?

My daughter has had her laptop for some time and has never been able to set up a mail account on the computer is there some way this can be loaded. Please help as I'm not living near by and would dearly love to sort it out for her with some simple action. Thank you. Teresa. There is no mail icon .

Just to add that she can get the mail icon but not put her hotmail account on it.

Incomplete mail setup, tried to delete it and reinstall to no avail

Hey guys! I got my mac about a year ago. I was halfway through the mail setup, and then I decided I didn't need the program at the time. Now I want to use it, but I can't get into it because the password I provide is "wrong." I use the same password for everything, so I'm baffled. I deleted my mail program, and then reinstalled it, but still couldn't enter for the same reason. The exact message that comes up occurs at the "enter password for the account" window that pops up, and it keeps saying that the .Mac server "mail.mac.com" has rejected my password. Help!

Hello, and welcome to the Discussions.
Have you in fact subscribed to, and maintained a .mac account, or are you merely planning to access another account, such as a POP account provided by your ISP?
Could it be that you have set up the free .mac, but now it will have expired, thus resulting in this message?
If you do not have an active .mac account, then you need to purge the preference file, which is at Home/Library/Preferences, and is named com.apple.mail.com.
More info, please.
Ernie

Mail setup problems on iPhone 6

Just got a new iPhone 6 and I am having problems getting mail setup and working properly with my 4 comcast POP accounts. The first one set up fine and let me select POP as the account type. The next two verified, but as IMAP accounts and gave me no choice to set them up as POP accounts. The fourth did give me the choice of a POP account. Although they all verified, no mail is coming through. I had no problems with my iPad Air 2, or my iPod, so something must be different on the phone.

Hello gbol,
I understand you are having trouble setting up four POP email accounts on your iPhone 6. Have you tried to back up your iPad Air to iCloud and restore your new iPhone from that backup? That may be one way to resolve this issue.
Transfer content from an iPhone, iPad, or iPod touch to a new device - Apple Support
https://support.apple.com/en-is/HT201269
The resource below provides some adiitional information regarding using POP accounts.
Using a POP account with more than one device - Apple Support
https://support.apple.com/en-us/HT201855
Hope that helps ...
- Judy

Simple question; Mac Server Setup for Mail, iCal and Address Book Services.

Hi Guys;
I'm new to the Mac Server world and need a few questions answered.
I have purchased a new Mac mini Server for hosting File, Web, Mail, iCal and Address Book Services.
I’m comfortable setting up File and Web Services however I’m a bit uneasy setting up Mail, iCal and Address Book services to be access locally and remotely(via the internet).
My current setup is;
Internet connection (Dynamic IP) -> Router -> Mac mini Server.
I have purchased a domain name (Thornton-net.com) from DynDns.com + a custom DNS service as I can setup my router to update my domain’s IP address automatically.
I can access File and Web Services remotely (thortnon-net.com) perfectly without any issues via the Port Forwarding feature of the Router.
If I setup Mail, iCal and Address Book Services -> will Mail, iCal and Address Book clients be able to access these services hosted by the server via Thornton-net.com?
Message was edited by: Allan.Thornton

Welcome to the forums.
For mail services (and specifically for your outbound mail to be accepted by other mail servers) your mail server needs to have a static IP address and matching forward and reverse and MX records, or a tunnel to a static IP (with matching DNS), or you need another mail server where you have an authorized relay. Without that, your mail will be considered a spam engine, and dropped.
Additionally, your particular tier of service with your ISP (with a static IP) will generally allow server-oriented access and server-oriented network traffic, where a residential or other tier of service (with a dynamic IP addresses) can be firewalled.
The ISP controls the "high ground" of the network connections here, so you pretty much get to play by their rules and requirements. If they don't offer static IP, then (presuming their T&Cs permit it) you get to tunnel (via IPv6, for instance) to a tunnel broker, and receive your network traffic via that (and with matching DNS) point of presence. That could well be a tunnel for your mail at whichever your DNS provider is here, because you'll have issues with your dynamic address. (You get to sort out if they offer that.)
Far and away the easiest approach (if you want to host this stuff yourself) is to work with the ISP. They're inherently involved in your network, and they and they alone have full control over your reverse DNS configuration.

Help with mail users and setup 10.6 mail server bound to 10.8 Open Directory

We have a 10.7 Open Directory server which was upgraded from 10.6. We have had some Open Directory issues since the upgrade. I am manually creating a 10.8 server as a replacement for the 10.7 server. All settings for services are running as expected and we are ready to turn over to the new server except for a problem with the ability to receive email.
Setup in both the original and the replacement has the OD server with DNS running with a correct MX record pointing to our 10.6 mail server.
In the replacement OD server the mail users were created as network users, with no userhome, with access to the mail service, and email addresses given.
The mail server was unbound from the original OD server, bound to the replacement OD server without SSL exactly as with the original, and restarted.
Initially the mail service said that mail clients had the wrong name or password. Opened WGM 10.6 on the MAIL server and checked the OD records. They showed the mail users not having the checkbox saying they were set up to receive mail selected. Selected the checkbox to receive mail.
Now the mail client seems to connect to the server correctly but does not show the emails in the system for the users. It is as though there is no email and the account is brand new.
Unbind the mail server from the replacement OD server, rebind it to the original OD server, and restart.
Mail clients connect and receive the mail in the accounts as expected.
Any ideas?
Thanks

I figured out what the mail server is doing. It has created new email stores for each of the new users. If we bind to the original OD it uses the original set of email stores. If we bind to the replacement OD it uses the new set of email stores.
I have tried to make sure that the userIDs match in each OD but that did not help.
The server is working for each OD. Does anyone know if I can tell the 10.6 mail server to use the old emails in the mailstore for the new user in the new OD?
If nothing else I can solve the problem by archiving the emails and copying them into the new user when running the new OD.

Help with OSX server mail setup

Please if anyone can tell me what I am doing wrong, I would be very grateful. I have a company with an externaly hosted website and an an internally hosted email (OSX server). I have everything kind of working, but some things don't seem quite right. I'll explain below:
I have a purchased domain: mycompany.com hosted by godaddy.
I am using Godaddy name servers: ns65.domaincontrol.com and ns66.domaincontrol.com
The external godaddy DNS has an a name entry for my mail server: mail pointing to 123.123.123.123 (which is my companies external static IP address).
There is also a null (@) a name record for my website hosting service (squarespace) pointing to 456.456.456.456
There is a cName record www pointing to the squarespace domain "www.squarespace6.com" (know this is unusual, but it is how squarespace asks this to be set up and does not work otherwise)
There is an MX record with priority 10 and host name @ pointing to mail.mycompany.com
I have a airport extreme router with the appropriate ports forwarded to the OSX server.
The DNS servers on the router are pointed to the internal IP address of the OSX server
I did not change the domain name on the router (mistake?) it is currently san.rr.com
On the OSX server I have set up host name to be mycompany.comDNS is set up with primary zone being mycompany.com
Primary Zone entries include
nameserver = mycompany.com
machine record host name is mycompany.com and the IP address is the internal IP address of the OSX server
another machine record with host name "mail" and IP address is the internal IP address of the OSX server.
Finally, there is a mail exchanger record with mail server "mail.mycompany.com" and priority 10
There are 2 entries autocreated in the Reverse zone
Mail is setup and running on the OSX server providing mail for "mail.mycompany.com"
Users are setup with email address: [email protected] (note: without the mail subdomain - I think this is OK?)
I am using self signed certificate.
In my clients (windows Thunderbird, Mac Mail, iOS mail), the settings are for the incoming mail server host name to be "mail.mycompany.com" and the outgoing also to be "mail.mycompany.com"
I woud have expected this to be imap.mycompany.com and smtp.mycompany.com respectively, but it doesn't work when I input these values and works with the former. Have I set this up wrong?? imap seems to require SSL on port 993 and SMTP seems to require TLS on port 587.Outlook on PC gives me an error that after googling appears to be a problem with not recognizing a fuly qualified hostname form the SMTP client. I see the fix, but wanted to know if that meant that my server didn't have a fully qualified host name and whether I should change that rather than just remove that restriction???
The final problem is that my outgoing emails seem to be getting caught up in other people's spam filters too frequently. What is the main reason for this? Is it because I have set something up wrong and it brings up flags or is it simply because I am not a huge hosting company, or somethign else althogether?
If you've gotten this far, big thanks! If you can help me, even more thanks!

Well, actually they are both getting caught up in spam filters and bounced back. I actually realized that part of the problem is that I have a dynamic IP address, but it doesn't change. Regardless, on the bounce back it looks like hotmail and other domains are rejecting email from my IP and recognize it as dynamic. This was a test server that i would by physically taking to my business where there is a static business IP address (Cox).
Sorry for the very long original message, but it seems that most people don't post enough information for the problem to be solved in their original posts and I was hoping to provide as much detail as possible.
The other is the question of "are things set up right?" It seems strange to me that both my outgoing and incoming servers are "mail.mycompany.com" and not imap.mycompany.com and smtp.mycompany.com and I wonder if this is going to cause me to have problems?
Is it a problem that my email addresses are [email protected] and not [email protected]?
Was I supposed to change the domain name on the router?
Also is it going to be a problem that I am using a self signed certificate?

New, Single Server - DNS, Web, Wiki, Mail Setup Issues

I'm having some issues properly setting up 10.7.3 to host internal DNS and external Web, Wiki and Mail. I'm having issues with the web and wiki hosting. Since those are the most important right now, I haven't really had a chance to fully test the other features. I was able to do some testing of the mail and iCal but it was limited.
Long read below but I thought the specifics would be helpful...
My goals and configuration are:
***GOALS***
Primary:
1) Host a public website: example.org and www.example.org
2) Host a public wiki: main.example.org and www.main.example.org
3) Host a public mail server: [email protected]
4) Host a public, group calendar
4a) Read only to majority - Read/Write to a group
5) Host a global address book for authenticated users
Secondary:
6) Allow anonymous public access to a file share (read only)
7) Allow authenticated access to the same file share (read/write)
8) Do as much of this via GUIs as possible.
***SETUP AND CONFIGURATION***
Physical:
1) Business class Internet (no blocked ports)
2) A single, public and static IP address
3) Domain name and public DNS via GoDaddy
4) Wildcard Cert: *.example.org from GoDaddy
5) Late 2011 (bought in Jan 2012) MacMini Lion Server (the $1,000 one).
5a) Upgraded the RAM to 16GB (need for VMware Windows clients)
5b) Added two USB to Ethernet adapters.
6) Using a new model AirPort Extreme Base Station (bought w/ the MM) as the main router.
Initial Configuration:
7) Setup a Mac Address reservation for the main and two USB Ethernet ports along with the wireless too.
7a) Main port = 10.0.1.5 / Others are .6, .7 and .10
8) During the setup, I chose the Host on the Internet (third) option and named my server: main.example.org
9) After the setup completed, I upgraded the OS & Admin Tool to 10.7.3 from a clean install (on #5 now)
DNS Config
10) I used the admin tool to open DNS and change:
11) "Primary Zone Name" from main.example.org to example.org.
12) In the "Nameservers:" block, I changed the zone name there but left the nameserver name alone (zone: example.org /// Nameserver Hostname: main.example.org).
13) The Machine Name and Reverse Zone was left alone. RZ resolves to main.example.org. sudo changeip -checkhostname is good. dig on the example.org and main.example.org are good to go (NOERROR).
OD Config
14) From the server app, I clicked Manage/Network Accounts and setup the OD - No issues.
SSL
15) From the server app, I created self signed cert, generated a CSR, got a public Cert, then replaced the self-signed with the public one - No issues.
16) Changed any service using the self-signed cert to the public one - No issues.
17) Changed the cert in the OD to the public cert from server admin - No issues.
In order: File Sharing, Mail, AB, iCal, Web, Wiki, Profile Manager, Network Groups, Network Users
18) File Sharing was setup using the server app
19) Setup mail using the server app to start it and the server admin app to configure it - No issues there (I think...)
20) AB - Flipped the switch to on
21) iCal - Flipped the switch to on - I setup the e-mail address to use after I added the network accounts.
22) Web - Flipped the switch to on - Default site worked (main.example.org)
23) Wiki - Flipped the switch to on - Default wiki worked. (main.example.org)
24) PM - Checked the sign config profiles and enabled the device mgt. I then flipped the switch to on - Default settings and pages worked.
***MY PROBLEMS***
Website:
Adding a website for example.org gave me the red dot in the server app. To fix that, I added a Machine Name record to my primary zone (PZ = example.org Machine Name = example.org). I first tried using the same 10.0.1.5 IP as the main.example.org and left the reverse mapping alone (still resolved to the NS of main.example.org).
That gave me the green light in the server app when trying to add the website again. From there, I changed the "Store Site Files In" to the location of my website files (and confirmed "Everyone" has Read Access in the folder's security settings). I left the other info alone (all defaults accepted) and clicked done.
Access to the website works on the server but external access doesn't (Network Error/timed out tcp_error). Checked the AirPort settings using the AirPort utility (version 5.5.3) and the Port Mapping (under the "Advanced" icon) show serveral services all pointing to 10.0.1.5. Thinking it could be DNS I tried main.example.org externally and it failed the same way.
I ran the changeip command (good to go) and dig on example.org and main.example.org and they both resolved to 10.0.1.5 correctly.
I removed the example.org Machine Record from the zone and it now looks like:
PZ=example.org / ZONE=example.org / NS=main.example.org
Machine Record=main.example.org / IP=10.0.1.5
RM=10.0.1.5 / Resolves=main.example.org
PLEASE HELP!

The amount of users (if relevant):
On site - 1 (Me)
Off site - 16 (Windows clients - some have iOS devices too)
Web site traffic - less than 50 regular visits per day (avg of 15) with a peek of ~125 once a month.
This is for a 501c3 public nonprofit made of all unpaid volunteers (including the officers and directors). All of us have paying day jobs and I just so happen to be the guy that knows just enough to get myself in trouble here.

Outlook 2013 Mail Setup Add Account crashes with Rundll32 error and will not connect to Exchange in Windows 8.1

I got a new Acer laptop with Windows 8.1 over 3 weeks ago, and installed Office Professional Plus 2013. I have an Office365 E1 subscription, but this Office 2013 is not associated with the subscription.
When I go to setup any email account using the automatic mode (primary will be Exchange Online with my 365 account, but I've tested POP email accounts with the same result), the Mail Setup crashes once the email address and password is entered and Next is
pressed. This error message is displayed:
"Windows host process (Rundll32) has stopped working
A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available."
The step displayed as in process when the crash occurs is the "Searching for [email address] settings". The first step "Establishing network connection" is checked complete.
I've run an Office Repair, and there's no change. I've run a clean boot, and even uninstalled/reinstalled with the same error still appearing.
If I use the manual setup mode and input the server outlook.office365.com, both the Check Name function and the Next button result in the error message:
"The action cannot be completed. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action." The folks in the Office365 support community have told me that Office365 ExchangeOnline
servers have to be configured with the auto-setup and cannot be setup manually.
I've done both a system refresh and a system reset, and I'm still getting the Rundll32 error. I tried to run a reset from a disk, but the laptop does not want to run it from the external DVD drive (giving error messages), so that doesn't appear
to be an option.
I've searched extensively, and there doesn't seem to be any existing threads where anything like this problem is discussed.
Can you offer any ideas or solutions?
After THREE WEEKS of troubleshooting this, and some significant delays in getting help from support, I'm really close to returning this laptop.
I need an answer on this ASAP to see if you've got an insights before I return the laptop for a new one.
Thanks,
Jason

IMPORTANT: I found the solution. Another user figured it out and posted the answer on another thread.
Please spread this around to all other Outlook support techs so they know to point people in the direction of the quick (though very obscure) fix to this problem.
See this thread for how to disable graphics acceleration in Office, which iswhat causes the rundll23 error.
http://answers.microsoft.com/en-us/office/forum/office_2013_release-outlook/rundll32-outlook-mail-windows-host-process-error/bf90e1fd-3985-4b15-bc50-f9b3e937a859?tm=1424345216297
Thanks,
Jason

Mail Won't Quit, and Keeps Reloading Old Mail from the Server

I recently had an apparent laptop battery failure while in Mail (while on battery). The machine abruptly shut down with no warning with about 55% power still available. It did this subsequently at random power levels. But, it always worked on the line power adapter. There have been no recurrences with a new battery.
Since I archive all my mail on my desktop machine, the laptop is set to NOT remove messages from the server after downloading.
1. After the first power failure with Mail active, on restart I got message from Mail to the effect that there was something wrong with the mail indexing, and if I would do X (don't remember what), then it would be fixed. I did X, and the system came up.
But, it had lost track of which messages had already been downloaded. Every time Mail was launched in downloaded the entire contents of the server spool, leading to massive duplications.
2. Then I discovered that I could not quit the application. If you tried, the first time it would close the message window, but remain active on the menu bar, with the "Quit" box grayed out.
I could force it to quit, but that may have been leading to it forgetting which mails it had already read.
I have run the disk utility, including the permissions check, and it reports that all is well.
I have reloaded Mail from the System disc, with no improvement.
I have tried deleting the com.apple.mail.plist file. But when Mail opens and brings up the Setup window, it fails to find the outgoing mail server.
Replacing the new plist with the original fixes the outgoing problem, but whether the new or old plist is in place, the multiple downloads and failing to quit both happen.
Since all of these attempts, a new symptom has emerged:
3. When dragging the Inbox messages to the trash (or using the Delete button), they do go to the trash, but remain in the inbox as well.
Any thoughts?

FYI: I found that there were two very-similarly-named folders in the users/(home)/Library/Mail folder.
One was called: POP-(username)@(ISP popservername).(ISP domain).
The other was called POP-(username)@(ISP popservername)@(ISP domain).
They both contained some of the core mail boxes, e.g. Deleted Messages, INBOX, Junk etc.
However, only one had the file: MessageUidsAlreadyDownloaded.
I copied the user mailboxes elsewhere and trashed these two folders. But opening Mail recreated them with all the same issues.
I trashed them again, along with the (boot disk)/Library/Mail, and the (bootdisk)/Applications.Mail.app file.
Then I reloaded the Mail app from the OS 10.5 Install DVD.
Launching Mail and setting its preferences cleared up the problem. Only one of the pop folders showed up and it correctly tracked the already downloaded files, and quit normally when asked.

Mail error "Verify that you have addressed this message correctly. Check your SMTP server settings in Mail preferences and verify any advanced settings with your system administrator.Select a different outgoing mail server from the list"

The Mail application has suddenly started giving error:
"Verify that you have addressed this message correctly. Check your SMTP server settings in Mail preferences and verify any advanced settings with your system administrator.Select a different outgoing mail server from the list"
It was working fine till yesterday, suddenly it stopped. I have 3 email accounts configured here, 2 are on exchange servers and one yahoo. Connection verification works and shows all servers as green.
Any inputs?

I had 3 accounts, 2 ms exchange accounts and 1 yahoo. After removal of yahoo, everything is back to normal.
Regards
Rohit

Mail setup and server verification

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