Hello, I tried to change my Mail settings away from a external SPAM Filter Service (Upstream) to let my UTM handle all by itself. What I understand is, that the UTM is opening Port 25 as Proxy and is forwarding the mails to the internal Mailserver and I don't have to set a Firewallrule for Port 25. I got curious when a lot of mails didn't get through and got back the SMTP Error 4.4.1 and made a check ( https://tools.dnsstuff.com/mstc ) that stated, that Port 25 is down? Is there anything I am missing in the firewall configuration? - Bernhard
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