Can't send mails due to Mailcow is using port 25 as standard.
Where can I fix this? I have changed in /etc/postfix/master.cf to
# Postscreen on Port 25/tcp, filters zombies (spam machines) on first level with lowest costs.
smtp inet n - n - 1 postscreen
# Postscreen passes sane clients to the real SMTP daemon here.
smtpd pass - - n - - smtpd
587 inet n - n - - smtpd
But still not working for me... All ports are open in my FW (OPNsense) and on the local FW on the server (UFW).