[Cialug] Postfix HELO

L. V. Lammert lvl at omnitec.net
Thu Aug 5 18:23:12 UTC 2021


Got past the first issue, .. but this one is more of a stumper:

Fixed the container hostname from 172.18.0.15 in generic:

# cat /etc/postfix/generic
#
# Fix the outgoing domain from a cranky container
#
@localhost.local  @<fqdn>


Now, however, some receiving email servers are getting blocked:

2021-08-05T14:14:10.448906-04:00 majordomo postfix/smtpd[178623]: disconnect from unknown[172.18.0.15] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
2021-08-05T14:14:11.006284-04:00 majordomo postfix/smtp[178627]: 6C9C473D1: to=<lvl at omnitec.net>, relay=mx2.omnitec.net[206.197.251.201]:25, delay=0.57, delays=0.01/0.01/0.31/0.24, dsn=5.0.0, status=bounced (host
mx2.omnitec.net[206.197.251.201] said: 504 <majordomo>: Helo command
rejected: need fully-qualified hostname (in reply to RCPT TO command)

However, the HELO IS correct:

$ telnet mx2 25
Trying 206.197.251.201...
Connected to mx2.
Escape character is '^]'.
220 mx1.omnitec.net ESMTP

Appreciate any thoughts, ..

	Thanks!


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