E-mail error: Cannot Send Mail: The sender address was invalid

I can receive e-mail but cannot send it. Everything goes to my outbox. I did not change any settings. Nothing has changed that I know of. For months I could send e-mail -- now I cannot. I even e-mailed myself, and it says the sender address is invalid. Can anyone help? Thanks!

The "Recipient addresses are invalid" message is misleading.
Most ISP's don't allow you to send email through their SMTP server unless you are A) on their network (e.g. connected via wi-fi to a cable connection provided by your ISP) or B) you authenticate to their SMTP server.
On Blueyonder here in the UK (my ISP), you can send via their SMTP server from the iPhone over 3G as long as you authenticate to it. I setup my Mac mail to authenticate on outbound email sent via smtp.blueyonder.co.uk and it works fine. I then synced the mail settings to my iPhone and it works fine (although a little slow to send).
Alternatively your cellular provider usually runs their own SMTP server to which you will also have to authenticate, and you can send through it. For the iPhone in the UK O2 are the exclusive provider, and they have the smtp.02.co.uk gateway.

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Getting "Cannot Send Mail - One of the Recipient Addresses was Invalid"

Mail was working fine under version 1. Upgraded my original iPhone to version 2 and couldn't send emails. Get "CANNOT SEND MAIL. ONE OF THE RECIPIENT ADDRESSES WAS INVALID. OK" message whenever I attempt to respond to an incoming email or when sending a new email. Sometimes "Sending" progress bar goes all the way to the end, but I still get this error message and mail is NOT sent. This is still the case after I upgraded to 2.02 HELP!

I have since removed the email account and added it again. I tried this several times and came to the realization that the Apple iPhone software was not setting the account up properly. I saved the account even though I was warned by the software that it was not working properly. I then went ahead and carefully edited all the settings and made sure that they matched EXACTLY with those in MS Outlook. I also set Authentication to Password on both incoming at outgoing servers.
I finally got it working. What a pain!!

The iphone .... cannot be synced.The file name was invalid or too long.

the iphone .... cannot be synced.The file name was invalid or too long.
wat can i do to sync my iphone

Hi there rohitnitin,
It looks like the article below addresses the error message you are describing.
iTunes: Unable to sync photos
http://support.apple.com/kb/TS3697
-Griff W.

"One of the recipient addresses was invalid...

I can send a new email, but when I try to reply to any email, I get this error message and the email just sits in the outbox.

I get this same message even with new mails. And the recipient addresses are all valid. This suddenly started to happen after a long time of everything working just fine.
Would love to find an answer to this problem.

Can't send mail due to "One of the recipient addresses was incorrect" error

I have my iPhone set up with two mail accounts: my personal Yahoo account and my work e-mail account ([email protected], for example). I can send/receive email fine with my personal account, but for my work account, I cannot send any mail to any email addresses that are not people at my work with the same domain name (I can send to [email protected], but not [email protected]).
I thought the problem had to be with my settings, but I compared my settings on the iPhone with how I have my work email set up in Thunderbird and even Apple Mail. They're the same! So I'm at a loss. Any ideas?
Thanks!!

More than likely, yes, but since a MobileMe account is accessed as an IMAP account, when accessing the account with an email client you have the option to store messages on the server or locally on the hard drive or device. If your account has been compromised and someone is accessing the account with an email client on their computer, they could choose not to store the sent messages on the server so you wouldn't see them.

IPhone 3G Cannot Send Mail. The sender address was invalid.

All of a sudden, I cannot send mail. I get the message "Cannot Send Mail" The sender address was invalid.
I have reset the phone in hopes of resolving the problem. That did not work.
The mail that I'm sending to IS a valid address; I'm trying to RESPOND.
Please help.

The configuration and use of any outgoing server address (SMTP) may not be supported due to several factors including, but not limited to, the inability for the outgoing server (SMTP) to authenticate users (whether by IP or username/password) that are not directly connected to that Internet Service Providers(ISPs) network.
This is usually your HOME wi-fi and you are not connected to it because you are on your iPhone away from the house. This is mainly done to prevent unsolicited users from sending SPAM via the ISP's servers.
An alternative is to use ATT SMTP Server (for US) when you are on the 3G or data network for the carrier and not on your home wi-fi. So enable ATT SMTP server under Other SMTP servers under your Mail's account settings on the iPhone.
If you are interested you can obtain that information directly from the email provider. This article has a great temple that you can use to ask all necessary information from the provider including "If you use your ISP’s own email service (instead of a third-party such as Gmail), sometimes it may not work if you use another Internet access point, such as a cafe with wireless Internet. Ask your email provider if the settings they give you will work on other networks."
What to ask if you're having issues sending, receiving, or configuring Mail
http://support.apple.com/kb/HT1277

Cannot Send Mail: The sender address was invalid

I continually keep getting this prompt after every single email I send. The sender address is verified and is valid...HELP!!

This error message is not accurate.
This means there is a problem with the account's outgoing mail server.
Most, if not all internet service providers block the use of SMTP servers that are outside of their network or not provided by the ISP being used for your internet connection at the time unless the SMTP server is authenticated. A cell phone carrier's network is no exception. This restriction is part of an overall effort to prevent spam emanating from the ISP's domain.
Who is the email account provider for this account? Do you know if the account has an authenticated SMTP server?
What country are you located in and who is your cell phone carrier?

I cannot send email - error message as follows : 'The sender address (my email address) was rejected by the server smtp.tiscali.co.uk.' I can send email from other apple devices, and the email settings are identical. Any ideas?

For some reason I cannot send email - all was working fine, but now I get the following error message when I try to send email:
'The sender address (my email address) was rejected by the server smtp.tiscali.co.uk'
I can receive incoming mail ok and I can send email from other Apple devices. The problem seems confined to my Mac Book Pro.
Ant ideas?

Hello there, Pablo639.
The following Knowledge Base article offers up some great steps for troubleshooting mail issues on your Mac:
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/TS3276
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

Messaging Server 4.1: Received mail is not returned to the sender if the receiving local account does not exist.

I have found that received mail is not returned to the sender if the receiving
local account does not exist. This problem occurs even if I use Console to
enable the Return message to sender option under the error handling methods.
In addition, I have used the configutil
to confirm that I have set the value
for Unknown account action to "13," which corresponds to the settings "Return
message to sender," "Notify the postmaster via email," and "Log the error in
the log file." Yet, in this situation, an error message is being sent to
postmaster, but not to the sender, and the error is not being recorded in the
log file.

Do the following steps: 

<OL>
<LI>From Console, open the appropriate Messaging Server.
<LI>Click the Configuration tab.
<LI>Open the Services folder.
<LI>Select SMTP.
<LI>Click the System tab.
</OL>

Check the "Domain handled by this server exclusively" field to make sure that
your mail domain is listed. If your mail domain is not listed, then Messaging
Server will assume that there is another mail server that is handling the
domain listed and will forward requests to this server.

For more information, please see the document Messaging Server
Administrator's Guide, Chapter 3, Configuring SMTP Services at 
http://docs.iplanet.com/docs/manuals/messaging/nms41/ag/smtp.htm#1010371

On Thu, 12 Dec 2013 16:16:02 +0000, lpphiggp wrote:
> I'm seeing this XTCOM error occur all over our /var/log/messages for one
> server, running SLES11sp2 / OES11/sp1;
>
> I don't really know what this is even for. We don't use NetStorage or
> iPrint even, this server only does basic NCP file serving, DHCP, and
> hosts a GroupWise PO.
> Is this anything to be concerned about?
If this:
http://www.linuxquestions.org/questi...entication-vs-
edirectory-825043/
is to be believed, it seems to indicate that your NAM configuration on
this server is not valid. I'm not seeing this message here on the OES
servers I looked at, and NAM is working correctly here.
David Gersic dgersic_@_niu.edu
Knowledge Partner http://forums.netiq.com
Please post questions in the forums. No support provided via email.
If you find this post helpful, please click on the star below.

HT2480 Ipad mini - exchange email stopped working randomly Error: "Cannot get mail. The connection to the server failed."

I got an iPad mini over Christmas and have had no issues setting up/managing my email until yesterday. I've had my Exchange email working for almost a month, and yesterday I stopped getting emails and getting the error: "Cannot Get Mail. The connection to the server failed."
I tried resetting the device (multiple times) and deleting and recreating the Exchange account (multiple times). This is getting annoying because it worked fine up until yesterday. I'm not aware of any updates to the device, or any changes that have occurred since yesterday.

Due to a screen issue, I had my iPhone 5 replaced two days ago. I repeated deleted the mail account and kept adding it but this did not make any difference. When I attempted to setup the new phone with my Google (Gmail via exchange active sync) accounts I was receiving this same "Cannot Get Mail" error. From what I was able to gather, this problem should be affecting Gmail accounts set up via Exchange. When originally purchasing the phone I was assisted and directed to set up my Gmail account through Exchange because it had the ability to use "ActiveSync" and push not only mail and calendars, but all of my contacts as well. I found this article regarding the subject.
http://www.pcmag.com/article2/0,2817,2413283,00.asp
What it came down to was having to delete my Gmail via Exchange account and separate it into two different accounts, a regular gmail account for my mail and a CardDAV account for my contacts.
Here is what I did. Google is changing their system and for new registrars Exchange ActiveSync will not work so you will be unable to register your account via Exchange and have your mail, calenders, and contacts all pushed together. I find this change really annoying. If you are having problems accessing your contacts after deleting the mail account, like I was, here is the work around.
To circumvent this issue go to Setting > Mail, Contacts, Calendars > Add Account > Other > Add CardDAV Account: Under server ender google.com, then your email user name and password, then click next to verify the information.
I hope this helps.

Our company have just upgraded to iOS 6 and the majority of the users are now receiving the following error 'Cannot Get Mail – Server error. Contact your server administrator' when accessing ms exchange this never happened on iOS 5 can anyone help

Our company have just upgraded to iOS 6 and the majority of the users are now receiving the following error 'Cannot Get Mail – Server error. Contact your server administrator' when accessing ms exchange this never happened on iOS 5 can anyone help

Have you tried deleting the account and re-adding it on the phone?
What version of Exchange server are you running?

Mail server log says: master[50]: ERROR: Cannot start mail services...

Recently, after a year or more of relatively smooth service, my OS X Server 10.4.11 Mail services has been locking up daily.
I was finally able to get some information from the log files (I am a noob to this) and saw the following right after my most recent reboot of the server:
Oct 5 09:51:11 mm1 master[50]: ERROR: Cannot start mail services, configuration directory does not exist: /Volumes/Data/mail/var/imap
I checked the server and that directory is indeed there on the partition named "DATA", so I am baffled as why the server does not thing the configuration directory exists?
drwxr-xr-x 15 cyrusima mail 510 Oct 5 09:51 imap
drwxr-xr-x 15 root admin 510 Oct 3 20:01 imap.BAK
drwxr-xr-x 15 cyrusima mail 510 Oct 3 20:05 imapold10032009-200707
drwxr-xr-x 4 jkoerber admin 136 Dec 3 2007 spool
mm1:/Volumes/Data/mail/var jkoerber$
Can anyone help me? My customers are yelling for blood because they cannot send/receive emails.
-- Jon
Message was edited by: Jon Koerber

Thanks Alex for the feedback. You are helpful as always!
It's good to know that the message I am getting from the mail server about the configuration files is only a temporary thing. Although I find it strange that the mail service doesn't know where its config files are since it is specified in the mail server setup.
I looked at the log files you mentioned and do not see anything that looks like a specific problem with the mail services themselves.
Recently, however, I have been having recurring problems where my mail server and my Web/Database server have both become unresponsive at nearly the same time even though they are on different class A networks to where I cannot access them via ARD, Server Admin and even SSH. That is usually when my mail server goes offline. I was afraid it was because of that configuration error I was seeing, but think now that the problem could be something else entirely (maybe some kind of network problem or denial of service hacking attack, no idea).
Thanks again.
-- Jon

ERROR: Cannot start mail services, configuration directory does not exist

I'm running an Xserve G5 with one internal boot drive and one RAID using the other two internal drives. I used Apple's Disk Utility to set-up the RAID.
Back in early December, I moved my mail database and mail store to the RAID. Ever since, when I restart the server, the mailaccess.log generates the following error:
Jan 23 18:51:33 mail master[47]: ERROR: Cannot start mail services, configuration directory does not exist: /Volumes/RAID/mail.data/db
I'm speculating this is a timing error that gets created when Postfix initially can't find the RAID. Then, it must try again and find it because the error message does not repeat and mail starts running.
Is this something to worry about?

Hi Joel,
You're right, it's a timing issues. The mail system is ready for work before the file system is mounted. It's benign.
Jeff

Mail problem - "Sender address was invalid"

So I get this message from time to time: then I try to send an e-mail from the mail app on my iPod Touch, it'll come back to me saying "The Sender Address was invalid" and won't send it. However, it's gotten worse of late; previously, I would hit the refresh button and then it would send, but recently that has stopped working. For about 45 minutes this morning I tried to send an e-mail and it just wouldn't send. I ended up having to log into my e-mail manually (through Safari on my iPod) to get it to send (which worked). However, I would like to know if anyone else has encountered this problem, if anyone knows what causes it, if anyone knows how to solve it, and if it would be worthwhile submitting a bug report to Apple about this. Thanks.

With so many threads and indy websites posting this problem, I'm not sure where's best to post my solution. So it's here and I hope someone gets help from it.
Same thing - "sender address blah blah blah" and none of the fixes worked. So I deleted the outgoing server (or so I thought!) and restarted the iPod. The server was not listed.
Then I reentered the information and used Port 25 (I had tried that before but went back to the default port of 587 before deleting the old server).
I connected to my WiFi and my mail went thru immediately. But what was interesting was the 'old' server showed up as the backup with port 587. I don't dare touch a thing - it's working!
BTW, I am using my own website and mail servers (hosted elsewhere).
Interestingly, if the iPod is accessing the mail servers, the computer access is blocked. Probably my host no allowing multiple connections from the same location, but I've done that before with my laptop and other Macs here w/o a hitch. But really a big deal, but interesting.
Thanks to all who have posted in this thread and all the other threads. Together, we ARE tech support! But the Apple guys and gals are great as well. And this iPod Touch is AMAZING!

In Apple Mail, I cannot add more than one address to the "To" line

In Apple Mail, I cannot add more than one address to the "To" line by typing just the initial

HHow are you. Trying to add the second address? Normal procedure after the first address is to type a comma, then start typing the name for the second address.

E-mail error: Cannot Send Mail: The sender address was invalid

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