In several functions of IP Office and network equipment management, email is sent from an automated process to a recipient via SMTP. SMTP is a fairly simple protocol that can be emulated via command lines. Using these command lines, setup information can be verified about the server to which the message is being sent. The only tool necessary for this test is telnet. The commands do have to be fairly exact, but are not hard to implement.
In the example the message will be from email@example.com and delivered to firstname.lastname@example.org via mail.example.com. Start off with opening a command prompt or telnet client on the voicemail server.
telnet mail.example.com 25
mail from: email@example.com
rcpt to: firstname.lastname@example.org
Subject: Voicemail test
this is a test message from the voicemail.