pSome internet access providers have port 25 disabled in their routers to prevent spam. If you run your own email…

More and more internet access providers are closing port 25 to reduce spam except for connections to their own mail…

Postfix provides several shell programs to manage the mail queue. These are: postsuper postqueue mailq In this tutorial, I will…

If you get an error like: Apr 15 12:41:03 webb4 postfix/sendmail[11234]: fatal: web1_user(12967): queue file write error in your mail…

When a server has more than one IP address, then postfix will use all IP addresses randomly to send out…

The command below enables a stricter SPAM handling for postfix on ISPConfig 3 servers. In Detail: Reject sender hostnames with…

You might see the error: postfix/master[5309]: fatal: 0.0.0.0:smtps: Servname not supported for ai_socktype On a OpenSuSE server when you enable…