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I have an Apache server which has been happily sending emails for the past few years - earlier this week the from address on all emails sent by postifx has changed and, as a result, 99% of messages are getting bounced or marked as spam.

I am not aware of any changes made to the server or DNS yet emails are being bounced and blacklisted.

In my maillog I have two messages sent 7 minutes apart - the first one is fine and gets sent but everything subsequent bounces:

Sep  3 08:04:52 web01 postfix/pickup[1760]: 9E75E490081: uid=48 from=<apache>
Sep  3 08:04:52 web01 postfix/cleanup[2597]: 9E75E490081: warning: header To: 
    RECIPIENT1, from local; from=<[email protected]>
Sep  3 08:04:52 web01 postfix/cleanup[2597]: 9E75E490081: warning: header 
    Subject: Subject from local; from=<[email protected]>
Sep  3 08:04:52 web01 postfix/cleanup[2597]: 9E75E490081: message-id
    <[email protected]>
Sep  3 08:04:52 web01 postfix/qmgr[1069]: 9E75E490081: from=<[email protected]>, 
    size=850, nrcpt=1 (queue active)
Sep  3 08:05:06 web01 postfix/smtp[2600]: 9E75E490081: to=<RECIPIENT1>,
    relay=RELAY[XX.XX.XX.XX]:25, delay=14, delays=0.34/0.02/2.4/12, dsn=2.0.0, 
    status=sent (250 OK id=1XP5Yn-000AW9-Bm)
Sep  3 08:05:06 web01 postfix/qmgr[1069]: 9E75E490081: removed

The main difference is that the from address has changed from [email protected] to apache.domain.domain and domain.com has changed to just domain:

Sep  3 08:11:31 web postfix/pickup[1065]: 35425490081: uid=48 from=<apache>
Sep  3 08:11:31 web postfix/cleanup[1634]: 35425490081: warning: header To: 
    RECIPIENT2, from local; from=<[email protected]>
Sep  3 08:11:31 web postfix/cleanup[1634]: 35425490081: warning: header Subject: 
    Subject from local; from=<[email protected]>
Sep  3 08:11:31 web postfix/cleanup[1634]: 35425490081: message-id
    <[email protected]>
Sep  3 08:11:31 web postfix/qmgr[1066]: 35425490081: from=<[email protected]>, 
    size=855, nrcpt=1 (queue active)
Sep  3 08:11:35 web postfix/smtp[1637]: 35425490081: to=<RECIPIENT2>, 
    relay=RELAY2[XX.XX.XX.XX]:25, delay=4.8, delays=0.12/0.02/2.7/2, dsn=5.0.0, 
    status=bounced (host RELAY2[XX.XX.XX.XX] said: 550-Verification failed for 
    <[email protected]> 550-The mail server could not deliver mail to 
    [email protected].  The account or domain may not exist, they may be 
    blacklisted, or missing the proper dns entries. 550 Sender verify failed 
    (in reply to RCPT TO command))
Sep  3 08:11:36 web postfix/cleanup[1634]: 2497D554007: message-id=
    <[email protected]>
Sep  3 08:11:36 web postfix/bounce[1639]: 35425490081: sender non-delivery 
    notification: 2497D554007
Sep  3 08:11:36 web postfix/qmgr[1066]: 2497D554007: from=<>, size=3591, 
    nrcpt=1 (queue active)
Sep  3 08:11:36 web postfix/qmgr[1066]: 35425490081: removed

Any idea what could have caused this and, more importantly, how can I fix this?

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Using a bogus address as envelope sender is causing the issue.

The specific error messages you are receiving, indicate that this is the problem:

550-Verification failed for 
<[email protected]> 550-The mail server could not deliver mail to 
[email protected].  The account or domain may not exist, they may be 
blacklisted, or missing the proper dns entries. 550 Sender verify failed 
(in reply to RCPT TO command))

See where it says "The account or domain may not exist"

That's your problem. Use a valid address (and that includes using a valid domain) as your envelope sender, as well as in your From header.

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  • 1
    Hi Joe - the problem is it used to show [email protected] and now it shows [email protected] but I have no idea what changed. It worked prior and now it doesn't now - hostname shows web.domain so I assume I need to change that to [email protected]? Is that all I need to do?
    – bhttoan
    Sep 6, 2014 at 17:58
  • 2
    Maybe. You may need to change whatever web application is doing the sending to use the correct sender info. Either way, thats really a different question. Why is the mail rejected? Because of the sender change. Why the sender change and how to fix, is a separate but related question.
    – Joe Sniderman
    Sep 6, 2014 at 18:01

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