I need to check mail server written with Erlang and CommuniGate Pro with black box method.
I already checked work of POP3/IMAP/SMTP protocol via telnet.
Also work of mail server via STARTTLS, SSL/TLS with the list of popular mail clients (Thunderbird, The Bat, MS Outlook and several others).
I can't check the web version because it doesn't done yet. There is only server interactions with clients. What also should I check here?