Mail Flow Issue In Exchange Server 2010

Hello,
I have an on-premises environment where I have an exchange 2010 hub and edge server. I have 4 domains. All my emails are routed through edge server to the internet. When I send an email from my primary domain to a particular remote domain the email gets
delivered. When I send an email from any other secondary domain the email does not get delivered at the remote end. The remote domain is on office 365.
I tried sending the email with the delivery receipt to the remote domain from my secondary domains and I always get the delivery receipt stating that the email has been delivered however the remote domain admin says that the email was never received by him.
We have also did the message trace on Office 365 remote domain but there was no trace of that email.
Please help and let me know how can I proceed futher this is hampering the productivity in my organization.

Thanks for your reply.
All my domains are added to office 365. My MX is pointed to office 365 but I send all the emails through my edge server. The remote domain receives emails on office 365.
We use DNS to send out emails

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All sub-folders in Mac Mail cannot synchronize with Exchange Server 2010

Hi all,
All sub-folders under Inbox in Mac Mail cannot be synchronized with Exchange Server 2010. There are 2GB messages size in Inbox folder and 500MB messages size under Inbox's sub-folders. All messages can be sent out and received and it can work in Outlook 2007 and Outlook 2010 normally. However, all messages in sub-folders cannot be synchronized (empty sub-folders).
Does this problem relate to message synchronization order of Mac Mail with Exchange Server? Do all sub-folders messages be synchronized after synchronization complete of Inbox? The synchronization of sub-folders will not happen if the synchronization of Inbox does not complete, doesn't it?
All messages synchronization is over internet. Can anybody help?
Thanks a lot
DT1640759

Hi,
1.please check the mailbox send and receive quota for exchange 2013 migrated mailbox.
2.Please check the email attributes of the exchange 2013 migrated mailbox because it seems to be a problem with that particular mailbox.
3.Then do the message tracking and that would be the only way to find the where the send messages has gone.
4.Please check and confirm you have an enough space on the disk where exchange queue database is residing.
I think I need to create a receive connector in the 2013 to receive from 2010 ?
No need ,by design exchange 2013 cas server default frontend receive connector will be having an
entire ipv4 and ipv6 segment and anonymous connection is checked by default.
I think I also need to create a send and receive connector for 2013 users to each other?
No need , an intra organisation send connector and the default receive connectors in exchange will be used
for internal mail flow between the exchange 2013 users.
Please reply me if you have any queries .
Regards
S.Nithyanandham
Thanks S.Nithyanandham

Outlook connectivity and mail flow issue on Exchange 2010 3 node DAG

Hi,
I have 3 node DAG, 2 (NODE A, NODE B) in Production site and 1(NODE C) in DR site. but just 1 AD Site.
when I have the active databases on NODE B, everything works fine. no issues to report.
but when I move the databases on NODE A, outlook gets connected with trying to update folders. Furhter, emails will be in outbox and no new emails will be delivered to the users. After an hour or so emails get delivered from outbox.
Even after supplying the credentials OWA doesnt login. just tries to load.
No issues when I move the servcies on NODE C.
ANy idea what could be the issue?
Thanks,
Vinod

Hi Vinod,
According to your description, there is one-hour delay in the process of sending and receiving emails.
To check if it’s caused by Autodiscover service, we can use the tool Test Email AutoConfiguration：
1. Hold CTRL and Click the outlook Icon in the system tray and select “Test Email Auto Configuration”.
2. Deselect the “Use Guessmart” and “Secure Guessmart Authentication” and click Test.
3. Check SCP value returned
For more information, please refer to the following article:
http://blogs.technet.com/b/exchdxb/archive/2012/05/10/troublshooting-autodiscover-exchange-2007-2010.aspx
http://support.microsoft.com/kb/2663435
http://support.microsoft.com/kb/262052
If connectivity is well, the issue is mostly likely caused by the Exchange mail submission service.
We can check if the service work properly. And the issue may be not related to the Hardware Load Balancer. Because the emails are stuck in the client side.
Thanks,
Angela Shi
TechNet Community Support

Any fix for mail stuck in outbox in Mail 5.1 (using Exchange Server 2010)?

Every couple of days I will notice that mail hasn't been sending from my Exchange email account in Apple's Mail 5.1. There doesn't seem to be any issues on the server side so it is probably something on my side of things.
I have checked my settings with our Exchange Server representatives and everything should be fine. The 'stuck' messages will send only if I take the account offline temporarily, move the messages to a draft folder, bring the account back on line and then drop the messages one by one back into the outbox.
First, I had to 'unhide' the Outbox just to notice the problem. Now, the outbox doesn't even show the unsent messages unless I take the account offline temporarily.
Anyone find a solution to this?

UNfortunately, the only "clue" I now have is that the emails get sent ONLY when I restart my computer!
This morning, I had a similar problem on my Mac Pro, but it was solved by quitting the Mail app. Not so this afternoon on my MacBook Pro. I had to restart.
This laptop has much less space left upon the HD than does my MacPro. But I must add, the problems on both have been getting worse over the last two days or so.
So, I am not encouraged.
As far as I can tell, I too have only been using one server--but the connection doctor does show two.
I have tried with both, with no difference in performance.
I am one of the people who had a dot.mac account from many years ago. I opted to continue with this, instead of going to the dot.me naming. By some strange chance, it that your situation, too?
At the moment, I can think of nothing else to try. Let's hope we solve this, for I think it bad for the computers to have to restart just to answer an email.

Mail Delivery betweek Exchange Server 2013 co-existance with Exchange server 2010

Hello Guys
I have a mailflow issue, hoping someone can help with detail description, below is the setup
Exchange server 2010 SP3 with all roles in one server
Exchange server 2013 SP1 with CU6 with all roles in one server - this server is in a different subnet to the 2010 server. I am able to see exchange 2010 databases and mailboxes from Exchange 2013. For testing purposes, I have moved 3 mailbox from 2010
to 2013. These 3 mailbox, is able to send and receive email from Internet but to each other via OWA or Outlook. These 3 mailbox also not able to send to receive email from any mailbox that is still in 2010 server via OWA or Outlook. I am not planning the whole
server cutover in a go and planning to do state by stage mailbox migration so I need mailflow working properly. When I send an email from one of the migrated mailbox that is in 2013 server, I can see that the email leaves the mailbox outbox and sits in the
queue ..
Can someone please provide detailed solution what needs to be configured?
MCITP, MCSA, MCSE,VCP - Consultant, Solution Design, Implementation

Hi,
1.please check the mailbox send and receive quota for exchange 2013 migrated mailbox.
2.Please check the email attributes of the exchange 2013 migrated mailbox because it seems to be a problem with that particular mailbox.
3.Then do the message tracking and that would be the only way to find the where the send messages has gone.
4.Please check and confirm you have an enough space on the disk where exchange queue database is residing.
I think I need to create a receive connector in the 2013 to receive from 2010 ?
No need ,by design exchange 2013 cas server default frontend receive connector will be having an
entire ipv4 and ipv6 segment and anonymous connection is checked by default.
I think I also need to create a send and receive connector for 2013 users to each other?
No need , an intra organisation send connector and the default receive connectors in exchange will be used
for internal mail flow between the exchange 2013 users.
Please reply me if you have any queries .
Regards
S.Nithyanandham
Thanks S.Nithyanandham

When sending e-mail messages to a mail-enabled public folder that have been replicated from old Exchange Server 2000/2003/2007, Exchange Server 2010 environment mails are rejected with NDR.

Hi, I would like to share with you issue that I’ve solved regarding mail-enabled PF that migrated from Exchange 2000/2003/2007 to 2010, I’ve searched & contacted my MVP leader – there’s no official KB regarding this issue right
now, so I’m posting here in order to share this among others.
Note: There’s article(s) that talked about PF replication from Exch2000/2003/2007 to 2010 – this is the same issue as well.
Symptoms
E-mail messages that been sent to mail-enabled public folder in Exchange Server 2010 environment rejected with the following NDR:
“#< #5.2.0 smtp;554 5.2.0 STOREDRV.Deliver.Exception:ObjectNotFoundException; Failed to process message due to a permanent exception with message The Active Directory user wasn’t found. ObjectNotFoundException: The Active Directory
user wasn’t found.> #SMTP#”
Sometimes Exchange Server 2010 is documented as well Event ID 1020 on the Event Viewer with this information:
“Log Name: Application
Source: MSExchange Store Driver
Event ID: 1020
Level: Error
Description:
The store driver couldn’t deliver the public folder replication message "Hierarchy ([email protected])" because the following error occurred: The Active Directory user wasn't found.”
Cause
In an environment where Microsoft Exchange Server 2000 or Microsoft Exchange Server 2003 previously existed, and all those servers have been removed, there is a chance that an Administrative Group (First Administrative Group or another custom Administrative
Group) remains with a Servers container, but no servers inside it.
During replication, when the Exchange 2010 Store Driver sees the empty Servers container in Active Directory, it's expecting a System Attendant object inside the container and when it is not found the error occurs.
Resolution
To work around the issue, delete the empty Servers container. This can't be done through Exchange System Manager. Use the ADSI Edit tool to remove it using the following steps:
Warning If you use the ADSI Edit snap-in, the LDP utility, or any other LDAP version 3 client, and you incorrectly modify the attributes of Active Directory objects, you can cause serious problems. These problems may require you to reinstall Microsoft Windows
2003 Server, Microsoft Windows Server 2008, Microsoft Exchange 2010 Server or both Windows and Exchange. Microsoft cannot guarantee that problems that occur if you incorrectly modify Active Directory object attributes can be solved. Modify these attributes
at your own risk.
1.
Start the ADSI Edit MMC Snap-in. Click Start, then
Run, and type adsiedit.msc, and then click OK.
2.
Connect & Expand the Configuration Container [YourServer.DNSDomainName.com], and then expand
CN=Configuration,DC=DNSDomainName,DC=com.
3.
Expand CN=Services, and then CN=Microsoft Exchange, and then expand
CN=YourOrganizationName.
4.
You will see an empty Administrative Group. Expand the
CN=YourAdministrativeGroupName.
5.
Expand CN=Servers.
6.
Verify there are no server objects listed under the
CN=Servers container.
7.
Right click on the empty CN=Servers container and choose
Delete.
8.
Verify the modification, and try to send again the E-mail to the mail-enabled public folder.
Applies to
Exchange Server 2010, Standard Edition
Exchange Server 2010, Enterprise Edition
Netanel Ben-Shushan, MCSA/E, MCTS, MCITP, Windows Expert-IT Pro MVP. IT Consultant & Trainer | Website (Hebrew): http://www.ben-shushan.net | IT Services: http://www.ben-shushan.net/services | Weblog (Hebrew): http://blogs.microsoft.co.il/blogs/netanelb
| E-mail: [email protected]

Sounds like you are looking in the wrong Administrative Group container which is why you are seeing your Exchange 2010 servers in there.
When you install Exchange 2003 only you will see a container named by default as "CN=First Administrative Group" container. But this could be named anything if you changed the Organization Name on the installation when you installed the first
Exchange 2003 server into the domain/forest.
You will notice that when you install Exchange 2010 part of the AD setup is to create a new configuration container and is named by default "CN=First Administrative Group (FYDIBOHF23SPDLT)".
So it sounds like you are not looking in the right location within ADSIEdit.
You may find the following article also helpful for this issue which is the same resolution:
http://blogs.technet.com/b/sbs/archive/2012/05/17/empty-cn-servers-container-causing-issues-with-public-folders-on-small-business-server-2011.aspx
I recommend though that you ensure your Exchange 2003 servers are fully uninstalled or no longer present in your environment before you go deleting the Servers container though.. The following Microsoft article will help with this:
http://technet.microsoft.com/en-gb/library/gg576862(v=exchg.141).aspx

Exchange Server 2010: Incoming mail not delivered

I have an Exchange Server 2010 Standard with all recent patches and updates.
-It has been in service for 3 years without any issues.
-There is plenty of hard drive space for the logs and the data (over 100GB in each)
-The current size of the mail database is 150GB
-There is no registry entry in place limiting the size of the database ([url="http://technet.microsoft.com/en-us/library/bb232092.aspx"]Database Size Limit in GB as outlined here[/url]
Starting a few days ago, incoming mail is reaching the server but not being delivered to user mailboxes. Internal mail works fine when this happens. Looking at the Queue Viewer doesn't show anything abnormal. The Submission Queue shows nothing.
It is only after I reboot the Exchange Server that the Submission queue will show all the messages waiting to be delivered and they will all be delivered successfully after the reboot. The event logs do not show any error messages.
The server will continue to run fine for a few hours and then the problem starts all over again.
What could be causing this?

Any 3rd party antivirus/anti-spam software installed on the server? If so, disable and test.
Twitter!: Please Note: My Posts are provided “AS IS” without warranty of any kind, either expressed or implied.

Exchange server 2010 unable to send internet mails to some domains but receives mail

Hi all, I have exchange server 2010 deployed and can receive mail with no issues but cant send mails to some external domains. I can send mails to gmail some others. Yahoo! is among the domains that rejects mails originating from my exchange server. Is
there anyone to assist please?

You can start here.
http://www.dummies.com/how-to/content/how-to-get-removed-from-an-email-blacklist.html
Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

TS4136 Apple Mail ActiveSync issue during Exchange 2007 to Exchange 2010 migration

When customer configures the ActiveSync account on Apple Mail (using Exchange Server 2010 CAS array name) for the user whose mailbox is on Exchange Server 2007, they are not able to get any mail and account displays offline. It shows the mailbox empty as well, even though mailbox has the email items in it.
But when same account is configured using ActiveSync (using Exchange 2007 CAS Server name) it works fine.
ActiveSync & Web Services URLs for Exchange 2010 and Exchange 2007 are given as below:
S#
Virtual Directory
URL
Exchange Server 2010
Exchange Server 2007
1
Web Services Virtual Directory
Internal URL
https://email2.domain.ae/EWS/Exchange.asmx
https://email.domain.ae/EWS/Exchange.asmx
2
Web Services Virtual Directory
External URL
https://email2.domain.ae/EWS/Exchange.asmx
https://email.domain.ae/EWS/Exchange.asmx
3
ActiveSync Virtual Directory
Internal URL
https://email2.domain.ae/Microsoft-Server-ActiveSync
https://email.domain.ae/Microsoft-Server-ActiveSync
4
ActiveSync Virtual Directory
External URL
https://email2.domain.ae/Microsoft-Server-ActiveSync
https://email.domain.ae/Microsoft-Server-ActiveSync
Following error is logged on Console on Mac when this issue happens:
30/10/12 3:27:28.398 AM
Mail
*** Assertion failure in -[EWSConnection _fetchRootFolderId:], /SourceCache/Message/Message-1278/MessageStores.subproj/EWSConnection.m:202
EWS fetchRootFolderId: expected one folder in response, received: 0
0   Message                             0x00007fff8cdeeef8 -[MFAssertionHandler _handleFailureWithPreamble:description:arguments:] + 116
1   Message                             0x00007fff8cdef08e -[MFAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 185
2   Message                             0x00007fff8cd1c8db -[EWSConnection _fetchRootFolderId:] + 768
3   Message                             0x00007fff8cd1deba -[EWSConnection _connectAndAuthenticateUsingAccount:] + 650
4   Message                             0x00007fff8cd1c42d -[EWSConnection connectUsingAccount:] + 462
5   Message                             0x00007fff8cd1996a -[EWSAccount authenticatedConnection] + 437
6   Message                             0x00007fff8cd2c00e -[EWSGateway connection] + 55
7   Message                             0x00007fff8cd2dddf -[EWSGateway sendMessage:forRequest:] + 43
8   Message                             0x00007fff8cd3e54c -[EWSRequestOperation executeOperation] + 108
9   Message                             0x00007fff8ce0f97f -[MonitoredOperation main] + 228
10 Foundation                          0x00007fff94aae6b4 -[__NSOperationInternal start] + 705
11 Foundation                          0x00007fff94ac1912 ____NSOQSchedule_block_invoke_2 + 124
12 libdispatch.dylib                   0x00007fff8adc8a86 _dispatch_call_block_and_release + 18
13 libdispatch.dylib                   0x00007fff8adc9965 _dispatch_worker_thread2 + 255
14 libsystem_c.dylib                   0x00007fff8a32c3da _pthread_wqthread + 316
15 libsystem_c.dylib                   0x00007fff8a32db85 start_wqthread + 13

Hi Akebono,
Let's check a few things in your server:
1. From the Organization Configuration - Client Access - Exchange Activesync policies - Default: Verify if the option "Allow non-provisionable devices" is ON.
2. From Server Configuration - pointing <YourExchange2010> - Certificates: Verify if your SSL certificate is assigned to IIS. (You should also be able to see this certificate from OWA https session)
3. The problem may also reside in iPhone outdated software, try to test activesync connection from iPhone with the latest OS version.
4. Take a look at logs in C:\inetpub\logs\LogFiles\W3SVC1\ of Exchange 2010, those might give some more details on connectivity problems.
5. If you still experience such problems - post the ExRCA error report here.
▲ Vote if Helpful / Mark if Answer
MCSE: Messaging 2013 Charter / Private Cloud / Server Infrastructure
MaximumExchange.ru

Any known issue reported for "Rollup 8 for Exchange Server 2010 Service Pack 2"

Hello,
Currently our servers are running with "Exchange 2010 SP2 RU7", we are planning to update the Rollup version to RU8 for SP2.
Is there any knows issues reported for "Rollup 8 for Exchange Server 2010 Service Pack 2" till now ? is it safe to update the RU8 ?
http://www.microsoft.com/en-us/download/details.aspx?id=41394

(1) I had to roll it back:
The rollup released Tuesday the 9th caused random problems with systems ranging from general slow down to operation failed errors. It didn’t impact everyone at once and seemed to take 48hrs for everyone to have a problem. Rolling
back the update and rebooting the server seemed to resolve the issue.
Issues reported before the general mailflow stopping for everyone:
Nothing major … an occasional operation failed when I hit send but, it will go thru after I hit the send button a couple of times.
A MICROSOFT OUTLOOK BOX APPEARS WITH A TRIANGLE WITH A ! INSIDE IT. THE MESSAGE SAYS THE OPERATION FAILED.
(2)
ANOTHER CODE APPEARED WHEN I TRIED TO SEND THIS E-MAIL SO I CLOSED OUTLOOK AND RE-STARTED OUTLOOK. THE MESSAGE READ, CANNOT CREATE THE E-MAIL MESSAGE BECAUSE A DATA FILE TO SEND AND RECEIVE MESSAGE CANNOT BE FOUND. CHECK YOUR SETTINGS IN THIS MICROSOFT
OUTLOOK PROFILE. IN MICROSOFT WINDOWS, CLICK CONTROL PANEL.CLICK USER ACCOUNTS AND THEN CLICK MAIL. CLICK SHOW PROFILE, AND THEN CLICK PROPERTIES.
When he tries to open an e-mail, he gets an error message.
If he tries to mark an e-mail unread, he gets a different message.
Thanks Ben

Exchange Server 2010 - Problem configuring my server 2008 so my clients can use Outlook to send/receive e-mails

Hi,
I am new to the servers and domains stuff. Therefore i have setup succesfully a Server 2008 R2 server with AD, DHCP, DNS roles installed. I configured the roles as i wanted and then i installed Exchange Server 2010 so the clients can use Outlook to send
receive mails in and out of the domain.
I can send/receive mails inside the domain (disalfa.com) but i cannot send/receive mails outside the domain. I configured the Exchange properly, i am sure of that. I am 99,9% i did something wrong with the DNS (A records, MX records, etc.).
Also is there something i must do from the control panel of the site i purchased the domain name and the mails?
Can someone guide me so i can manage to work this out?
Server 2008 - 192.168.1.250
Registered Domain - disalfa.com
Thank you in advance

Hi ,
I recommend you refer to the following article to configure your external mail flow:
Configure Internet Mail Flow Directly Through a Hub Transport Server
Prerequisites
Register MX resource records for all accepted domains in a public domain name system (DNS) server. Consult the documentation of your DNS provider for information about how to register MX records for your domain. Detailed procedures about how to complete
this step are outside the scope of this topic.
Configure network gateways to allow SMTP traffic to and from the Hub Transport server. Consult the documentation for your network routers and firewalls for information about how to route SMTP traffic to and from the Hub Transport server. Detailed procedures
about how to complete this step are outside the scope of this topic.
Best regards,
Niko Cheng
TechNet Community Support

Receive email delay one hour using Mac Mail client (Mountain Lion) connect Exchange Server 2010

Hi all,
My boss use iPhone, iPad, MacBook Air (Mac Mail client), MacPro (Mac Mail client) connect Exchange Serve 2010 to receive emails. All clients are okay except MacBook Air, the Mac Mail client cannot receive the latest emails from Exchange Server, but it can receive (sync) the emails after one hour. The other clients can receive the latest email after Exchange Server receive new emails immediately.
In this period, the MacBook Air can receive the other IMAP, POP3 and webmail from ISP normally. I tried to set 5 mins to check emails or manual check email from Exchange Server. However, the latest email still delay one hour.......... .
I dumped a screenshot for Mac Mail setting for Exchange Server and a Log file.
could anyone help me to solve this issue?
Thanks

I am not sure what the user has the check for new messages set for but mail does arrive as short as 2 minutes. It does however arrive on his iphone immediately first.

Exchange server 2010 sp2 slow issue

My Exchange server 2010 sp2 performance very slow in morning time 9 to 10 AM and evening time 4 to 5 pm only and other time working fine

Hello,
Forums for Exchange versions prior to Exchange 2013 are over here:
http://social.technet.microsoft.com/Forums/exchange/en-US/home?category=exchangeserverlegacy&filter=alltypes&sort=lastpostdesc
Karl
When you see answers and helpful posts, please click Vote As Helpful, Propose As Answer, and/or Mark As Answer.
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Exchange Server 2010 SP3 - Rollup 8 - Issue - Problems with client connections - MS Outlook 2013

Exchange Server 2010 SP3 - Rollup 8 - Issue - Problems with client connections - MS Outlook 2013
Detected Problems:
- Access denied for attached mailbox (department mailbox)
- Access denied for delete or move messages on own mailbox
- Can't send new messages with error (Error: [0x80004005-00000000-00000000])
Solution:
- Rollback to Exchange 2010 SP3 - Rollup 7
- You can rollback to Exchange 2010 SP3 - RollUp 7 in 30 min
Algunos de los destinatarios no recibieron su mensaje.
Asunto: Hola
Enviado el: 11/12/2014 8:35
No se puede localizar a los destinatarios siguientes:
'[email protected]' en 11/12/2014 8:35
Este mensaje no se pudo enviar. Inténtelo de nuevo más tarde, o póngase en contacto con el administrador de red.
Error: [0x80004005-00000000-00000000].

See the following forum thread:
https://social.technet.microsoft.com/Forums/en-US/1be9b816-b0ab-40ea-a43a-446239f8eae3/outlook-client-issues-following-exchange-2010-rollup-8

Exchange Server 2010 SP3 test environment - email flow to/from internet

Today I set up test environment for Exchange Server 2010 SP3 - domain controller running Windows Server 2008 R2 SP1, Exchange Server 2010 SP3 on Windows Server 2008 R2 SP1 and client computer running Windows 7 Pro SP1 x64 with Outlook Pro 2010 x64. These
machines are VMs on vSphere 5.0 cluster made of 4 esxi 5.0 hosts.
I have three years of experience in working with Exchange Server 2010 in my production environment but until recently I have not had enough resources to build a test environment. Does "testing" Exchange Server 2010 infrastructure have
a real life purpose considering the fact that only internal email flow is possible since authoritative SMTP accepted domain is not hosted anywhere thus not visible to outside world. This limited email flow combined with absence of possibility to test
ActiveSync, Outlook Anywhere, OWA from WAN, . . . really hurt and make Exchange Server rare technology that can not be tested completely before introducing something new into the production. Services that are not possible to test from the outside world are
useless and whole point of Exchange-like technologies is availability from anywhere and from whatever device.

I set up Internet Send Connector (by default this type of send connector uses DNS MX records to route email automatically). Having sent an email to my gmail account I did not receive it and in transport logs I saw that mx record was found successfully
but there is the following line:
2014-08-05T20:39:51.942Z,Internet Connector,08D17F000FE36010,1,,2a00:1450:4013:c01::1b:25,*,,"Failed to connect. Error Code: 10051, Error Message: A socket operation was attempted to an unreachable network 2a00:1450:4013:c01::1b:25"
I tried also to send an email to my production email address (we have Symantec Messaging Gateway which is used as a smart host (antispam,antimalware,content filter appliance)) but then error is:
2014-08-05T20:50:08.395Z,Internet Connector,08D17F000FE36019,1,,91.238.7.10:25,*,,"Failed to connect. Error Code: 10061, Error Message: No connection could be made because the target machine actively refused it 91.238.7.10:25"
Telnet from test exchange to 91.238.7.10 on port 25 also is not working.

Mail Flow Issue In Exchange Server 2010

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