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Emails Are Getting Rejected by Bounce Verification We Use IronPort

Posted on 2008-06-11
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Last Modified: 2008-06-19
I have an issue sending email to one domain. We get the message(s) depending on if we disable Bounce Verification on our IronPort or not.

Before Disabling Bounce Verification on Our End
Your message did not reach some or all of the intended recipients.

      Subject:            test2
      Sent:                 11/06/2008 17:01

The following recipient(s) could not be reached:

      user@recipient.com on 11/06/2008 17:01
            The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
            < mail-ip-in.mydomain.co.uk #5.0.0 smtp; 5.1.0 - Unknown address error 550-'Verification failed for <user@mydomain.co.uk>\nPrevious (cached) callout verification failure\nSender verify failed' (delivery attempts: 0)>


When I disable Bounce Verification, we get:

Your message did not reach some or all of the intended recipients.

      Subject:            test2
      Sent:                 11/06/2008 17:01

The following recipient(s) could not be reached:

      user@recipient.com on 11/06/2008 17:01
            The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
            < mail-ip-in.mydomain.co.uk #5.0.0 smtp; 5.1.0 - Unknown address error 550-'Verification failed for <user@mydomain.co.uk>\nPrevious (cached) callout verification failure\nSender verify failed' (delivery attempts: 0)>




Any ideas?
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Question by:thesurg3on
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3 Comments
 
LVL 28

Accepted Solution

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peakpeak earned 1500 total points
ID: 21767580
You should try sending a test email through Telnet to further investigate:
http://www.msexchange.org/tutorials/Telnet-Exchange2003-POP3-SMTP-Troubleshooting.html

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Author Comment

by:thesurg3on
ID: 21813768
telnet tested. it was bounce verification issue.
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Expert Comment

by:mpiib
ID: 33745916
It looks as it is a bounce verification issue together with sender base verification. If bounce verfication is in effect, all e-mail that is sent through the ironport towards the outside is tagged in the FROM envelope.
That is, the envelope address changes from "test@my.domain" to something like "prvs=test=26654df9b@my.domain". Now if the remote site uses some type of SMTP verification that is offered by "my.domain", it will ask "my.domain" for the existence of user "prvs=test=26654df9b" instead of user "test". Hence, delivery will fail.
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