James B. Byrne:
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>
>
> On Thu, December 17, 2020 14:28, Wietse Venema wrote:
> > Wietse Venema:
> >
> > Very likely, tls_wrappermode is turned on as it should be on port
> > 465, which requires the client to speak first (no server greewting,
> > no client EHLO and STARTTLS).
> >
> > Apparently, the client is configured to expect "port 578" server
> > where a server speaks first and sends a greeting before the client
> > sends EHLO and STARTTLS.
> >
> > Wietse
>
> Did you mean port 587?
Of course. Have you looked into the service type mismatch, wthere
the client expects a service like "submission" where the server
speaks first (plaintext SMTP before the client sends STARTTLS),
whereas Postfix is configured for the "smtps" service where the
client speaks first (as part of the TLS handhake, there is no
plaintext SMTP phase).
Wietse
