Error 550 5.1.1 User unknown

[ericbarreto21]

Hi,



Some boxes in my domain are not receiving emails for displaying this message. Verify Receivers is disabled, the emails in question exist in Exchange.
Could you please help me?


Following is an example log:

Dec 5 14:37:40 xxxxxx postfix/smtpd[11236]: connect from mail-lj1-f180.google.com[209.85.208.180]
Dec 5 14:37:41 xxxxxx postfix/smtpd[11236]: DE2AA1815C2: client=mail-lj1-f180.google.com[209.85.208.180]
Dec 5 14:37:42 xxxxxx postfix/cleanup[10291]: DE2AA1815C2: message-id=<CAP3EDKb3XFcYe6fg0ZcUB8JaAiPnUTWOYoN2EOadSzH6zD8bxA@mail.gmail.com>
Dec 5 14:37:42 xxxxxx postfix/qmgr[7248]: DE2AA1815C2: from=<XXXXX@gmail.com>, size=2761, nrcpt=1 (queue active)
Dec 5 14:37:42 xxxxxx pmg-smtp-filter[11936]: 181F8A5DE9325672BED: new mail message-id=<CAP3EDKb3XFcYe6fg0ZcUB8JaAiPnUTWOYoN2EOadSzH6zD8bxA@mail.gmail.com>
Dec 5 14:37:42 xxxxxx postfix/smtpd[11236]: disconnect from mail-lj1-f180.google.com[209.85.208.180] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 commands=7
Dec 5 14:37:46 xxxxxx pmg-smtp-filter[11936]: 181F8A5DE9325672BED: SA score=0/5 time=3.529 bayes=0.00 autolearn=ham autolearn_force=no hits=AWL(0.993),BAYES_00(-1.9),DKIM_SIGNED(0.1),DKIM_VALID(-0.1),DKIM_VALID_AU(-0.1),DKIM_VALID_EF(-0.1),FREEMAIL_ENVFROM_END_DIGIT(0.25),FREEMAIL_FROM(0.001),HTML_MESSAGE(0.001),RCVD_IN_MSPIKE_H2(-0.001),SPF_HELO_NONE(0.001),SPF_PASS(-0.001),TVD_SPACE_RATIO(0.001)
Dec 5 14:37:46 xxxxxx postfix/smtpd[11427]: connect from localhost.localdomain[127.0.0.1]
Dec 5 14:37:46 xxxxxx postfix/smtpd[11427]: 10520181F8B: client=localhost.localdomain[127.0.0.1], orig_client=mail-lj1-f180.google.com[209.85.208.180]
Dec 5 14:37:46 xxxxxx postfix/cleanup[11918]: 10520181F8B: message-id=<CAP3EDKb3XFcYe6fg0ZcUB8JaAiPnUTWOYoN2EOadSzH6zD8bxA@mail.gmail.com>
Dec 5 14:37:46 xxxxxx postfix/qmgr[7248]: 10520181F8B: from=<XXXXX@gmail.com>, size=4035, nrcpt=1 (queue active)
Dec 5 14:37:46 xxxxxx postfix/smtpd[11427]: disconnect from localhost.localdomain[127.0.0.1] ehlo=1 xforward=1 mail=1 rcpt=1 data=1 commands=5
Dec 5 14:37:46 xxxxxx pmg-smtp-filter[11936]: 181F8A5DE9325672BED: accept mail to <XX-XXXXXdeDeus@grupoXX.com> (10520181F8B) (rule: default-accept)
Dec 5 14:37:46 xxxxxx pmg-smtp-filter[11936]: 181F8A5DE9325672BED: processing time: 3.649 seconds (3.529, 0.035, 0)
Dec 5 14:37:46 xxxxxx postfix/lmtp[8834]: DE2AA1815C2: to=<XX-XXXXXdeDeus@grupoXX.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=4.2, delays=0.52/0/0.04/3.7, dsn=2.5.0, status=sent (250 2.5.0 OK (181F8A5DE9325672BED))
Dec 5 14:37:46 xxxxxx postfix/qmgr[7248]: DE2AA1815C2: removed
Dec 5 14:37:51 xxxxxx postfix/smtp[11004]: 10520181F8B: to=<XX-XXXXXdeDeus@grupoXX.com>, relay=XXXXX[XXXXX]:25, delay=5.1, delays=0.05/0/0.03/5, dsn=5.1.1, status=bounced (host XXXXX[XXXXX] said: 550 5.1.1 User unknown (in reply to RCPT TO command))
Dec 5 14:38:01 xxxxxx postfix/qmgr[7248]: 10520181F8B: removed

 

[tom]

relay=XXXXX[XXXXX]:25, delay=5.1, delays=0.05/0/0.03/5, dsn=5.1.1, status=bounced (host XXXXX[XXXXX] said: 550 5.1.1 User unknown

your host tells that the user is unknown.

 

[ericbarreto21]

your host tells that the user is unknown.

Thanks first for the reply. Yes, I know, this is the problem the user exists, this is a distribution email. And this happens with other mailboxes.

 

[Stoiko Ivanov]

Dec 5 14:37:51 xxxxxx postfix/smtp[11004]: 10520181F8B: to=<XX-XXXXXdeDeus@grupoXX.com>, relay=XXXXX[XXXXX]:25, delay=5.1, delays=0.05/0/0.03/5, dsn=5.1.1, status=bounced (host XXXXX[XXXXX] said: 550 5.1.1 User unknown (in reply to RCPT TO command))

The relay - here represented as host XXXXX[XXXXX] does not know that the user exists -> check the mail logs at 'host XXXXX[XXXXX]'

I hope this helps!

 

[ericbarreto21]

The relay - here represented as host XXXXX[XXXXX] does not know that the user exists -> check the mail logs at 'host XXXXX[XXXXX]'

I hope this helps!

Even though verify receivers is disabled, can this issue occur?

 

[Stoiko Ivanov]

This logline is not from receiver verification - it is from the attempt to actually deliver the mail - which is not possible, because the downstream server says the user does not exist

 

[ericbarreto21]

This logline is not from receiver verification - it is from the attempt to actually deliver the mail - which is not possible, because the downstream server says the user does not exist

I appreciate the explanations.