Gerben Wierda via Postfix-users:
>
> > On 31 May 2024, at 13:20, pat...@patpro.net wrote:
> >
> > Hello,
> >
> > Any sign of postfix 3.9 blacklisting HAproxy because of SMTP
> > errors/abuse/half-baked connections?
>
> Not blacklisting as I understand it, but as HAproxy makes a connection to
> test if the service is up and then breaks the connection I always see this on
> both systems:
>
> On the postfix 3.9 instance
> May 26 05:31:33 hermione submission_haproxy/smtpd[21485]: connect from
> router.rna.nl[192.168.2.2]
> May 26 05:31:33 hermione submission_haproxy/smtpd[21485]: improper command
> pipelining after CONNECT from router.rna.nl[192.168.2.2]: QUIT\r\n
> May 26 05:31:33 hermione submission_haproxy/smtpd[21485]: disconnect from
> router.rna.nl[192.168.2.2] commands=0/0
Yep, turn off smtpd_forbid_unauth_pipelining and try again..
Wietse
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