So I decided to give Google Cloud a try and setup a Perfect Server Debian 9. Have done it plenty of times before on my own servers and vm's...the only problem is that google blocks port 25 outgoing. They allow 587 and 465 though....but I can't seem to get it to work with emails leaving the server. Incoming email is fine. postfix master.cf has submission uncommented. roundcube, I've edited config.inc.php so it looks at port 587 with tls://%n and user credentials. roundcube shows the email going without error. I check mail.log and I see the email passing into amavis, BUT then I see it trying to leave google on port 25 again...could it be that amavis is reinjecting the email into postfix on port 25? If so, how do I change that? If not....what am I missing. Thanx.