Michel Verdier via Postfix-users:
> On 2023-08-09, Steffen Nurpmeso via Postfix-users wrote:
>
> > 192.0.2.1:submission inet n - n - - smtpd
> > -o syslog_name=vpnsub
> > -o smtpd_sasl_auth_enable=no
> > -o
> > smtpd_relay_restrictions=permit_mynetworks,reject_unauth_destination
> > -o cleanup_service_name=vpnsub_cleanup
> > vpnsub_cleanup unix n - n - 0 cleanup
> > -o {header_checks=regexp:{{/^Received:/ IGNORE}}}
> >
> > where 192.0.2.1 is the address where postfix listens on the VPN.
> > Shouldn't this be adoptable? (Ie special "cleanup" service.)
>
> You apply header_checks on cleanup. I think the header is added by
> postfix after incoming.
It is added by the smtpd process, i.e. before mail is queued.
The exception is that the header is omitted by an smtpd process
before an smtpd_proxy_filter. This was done to avoid stutter (two
near-identical headers from the smtpd processes before and after a
filter) but that overlooked the possibility that the filter is
delivering the message to a non-local SMTP server.
Wietse
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