[GRLUG] Postfix HELO issue

[Grand Rapids Linux Users Group]

Running a django container, sending email via postfix on the host, ...

Unfortunately, some receiving MTAs are getting blocked:

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 valid:

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

Appreciate any thoughts, ..

	Thanks!