OpenSMTPd filter - rewrite rctp

[danano]

hey! i am struggeling to implement a simple rcpt rewrite with opensmtpd

context:
a few machines in my lan network.
they send mail using ssmtp to a central relay.
the central relay runs opensmtpd.
accepts mail from all internal hosts without auth.
relays mail to an official smtp server in internet with auth.
i want it to rewrite all internal addresses to my real email.

so recipients that are used quite often are
- localuser@host.lan.mydomain.tld
- root@host.lan.mydomain.tld

the opensmtpd host is igel-2 and sends mail as well to
- root@igel-2.lan.mydomain.tld

config:

#$OpenBSD: smtpd.conf,v 1.14 2019/11/26 20:14:38 gilles Exp $
 
# This is the smtpd server system-wide configuration file.
# See smtpd.conf(5) for more information.
 
table aliases file:/etc/mail/aliases
table secrets file:/etc/mail/secrets
table rcpt { "@lan.mydomain.tld" }
 
# Relay all mail via Hostpoint's SMTP server using authentication
action "relay" relay host smtps://sharedhostingsmtpuser@smtp.sharedhoster.com auth <secrets>
 
# define filter
filter "rewrite-to" phase rcpt-to match rcpt-to <rcpt> rewrite "mail@mydomain.tld"
 
# build chain
filter "incoming_chain" chain {rewrite-to}
 
# catch all
match from any for any action "relay"
 
listen on socket
listen on all filter "incoming_chain"

problems:
no rewriting of recipients is happening.
i do not understand why, spend hours reading the man page.
i would be grateful to get some help.

[jggimi]

Hello, and welcome!

This is a guess on my part, but your table <rcpt> content is not in the expected format of userid@domain, and that may be why the filter never matches.