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Exchange 2003 - Outbound email being sent over and over again

Posted on 2011-02-23
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Last Modified: 2012-08-14
Morning,

Our Exchange infrastructure is as follows:
Exchange 2003 - Backend server to Front end server which then goes to our Sendmail SMTP servers, then there's the firewall and after that we use Postini to filter our email.

On monday morning one of our users sent an email to approximately 20 recipients. The email was 7mb in size. Since monday that email has continued to send to all of the 20 recipients, day and night. The recipients are as you can expect not very happy and we need this email to stop sending ASAP !!!!!
When i search in exchange, system manager, Message tracking center i can see the email being sent only once from our users account.
The exchange queues are empty.
When i look in the Postini logs, at email sent from the users account, i can see all of the resent emails going out.
Status in these logs for delivery of each resent email is ' Delivered successfully ' , except for one recipient who's status is always ' Reinjected '
I believe that because of this one recipient with the status of reinjected, the email is being resent to all recipients.
What do you think ?
How can i stop this email resending ?
I'm getting desperate, all options will be considered.

Thanks,
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Question by:AndrewLeg
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Expert Comment

by:Navdeep
ID: 34963557
Hi,

check this server "Sendmail SMTP servers" sometimes if the email is stuck in smtp temp table it may get resubmitted.
Also if you can check if the message id of couple of messages are same or different.

At first place reboot your sendmail smtp servers.

For exchange 2003 there is a hotfix but that issue occurs only if exchange server is restarted or smtp and information store is recycled. For now i will check sendmail smtp server.

any local antispam filter like symentac or gfi. try disabling them as well.
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Accepted Solution

by:
AndrewLeg earned 0 total points
ID: 34998859
The problem was with Postini.

If there are many recipients on an email, but delivery fails, Postini should strip out the successful recipient addresses and only try resending to the failed address.

In this instance Postini was resending to all recipients.

To resolve the issue we contacted the IT department of the company which was unable to accept the email due to its size (they can only accept emails upto 5mb), and they kindly increased the email limit to allow the message through.

As soon as it went through, all resends stopped.

I've contacted Postini to get them to investigate the bug.
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Author Closing Comment

by:AndrewLeg
ID: 35042607
It resolved the issue and was not suggested by anyone else.
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