[GRLUG] Postfix HELO issue

[Grand Rapids Linux Users Group]

What is your sender SMTP sending as for HELO ?

"fully qualified" means the receiver is expecting a full host and domain
name.



On Thu, Aug 5, 2021 at 2:50 PM Grand Rapids Linux Users Group <
grlug at grlug.org> wrote:

> 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!
> --
> grlug mailing list
> grlug at grlug.org
> https://shinobu.grlug.org/mailman/listinfo/grlug
>
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