Telnet testing. When you telnet on port 25 you should be greeted by 220 response code followed by the server name and MTA name.
# telnet mail.uplinkzero.com 25 Trying 88.198.15.207... Connected to ip1.uplinkzero.com. Escape character is '^]'. 220 mail.uplinkzero.com ESMTP Farm Yard Mail version 111.111 ehlo mail.uplinkzero.com 250-mail.uplinkzero.com 250-PIPELINING 250-SIZE 35651584 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN STARTTLS 220 2.0.0 Ready to start TLS ^] telnet> q Connection closed.
Repeat the steps above against amavis using port 10024
Of course, the other way to test is to use another email account to send email.
