Hi Andreas

On Thu, Aug 20, 2020 at 01:28:38PM +0200, Andreas Thienemann wrote:
> My plan was to setup a proxy on a backup machine somewhere else and just
> proxy 25/tcp to my primary MX. My initial plan was to use
> smtpd_upstream_proxy_protocol = haproxy and thus inform the smtpd of the
> real source IP of the connection to make limits etc. work again.

Use a different port?  SMTP with proxy protocol is only spoken between
controlled systems, so selecing some other port for it is no problem.

Just add to master.cf:

| 2525  inet  n  y  n  -  -  smtpd
|   -o smtpd_upstream_proxy_protocol=haproxy

And select the appropriate port on the forwarder.

Regards,
Bastian

-- 
Those who hate and fight must stop themselves -- otherwise it is not stopped.
                -- Spock, "Day of the Dove", stardate unknown

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