Error 550 5.1.1 User unknown

E

ericbarreto21

New Member
Jul 30, 2019
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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:



Code: 
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
 
Last edited:
ericbarreto21 said:
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
Click to expand...

your host tells that the user is unknown.
 
ericbarreto21 said:
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))
Click to expand...
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!
 
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
 
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