[MM3-users] Re: Postfix and Rspamd reject all Mailman messages after upgrading to Mailcow 2025-09b

As suggested, I tried to add Mailman's ip address to the list of "Forwarding Hosts" in Mailcow, but this din't help. All mails from Mailman were still rejected by Postfix/Rspamd. Instead, I followed the description here https://docs.mailcow.email/manual-guides/Postfix/u_e-postfix-unauthenticated... .

I added this line to /opt/mailcow-dockerized/data/conf/postfix/extra.cf:

mynetworks = 172.22.1.0/24 172.19.199.0/24

And this line to /opt/mailcow-dockerized/data/conf/rspamd/local.d/options.inc

local_addrs = [172.22.1.0/24, 172.19.199.0/24]

172.22.1.0/24 is Mailcow's own (docker) network, 192.19.199.0/24 is Mailman's

Now it seems to work :-)