You need to test manually an SMTP server that requires authentication.
The text you need to enter into a DOS or Unix command line is in
typewriter typeface. Responses from the server are shown in italic.
telnet smtp-server.smtpdomain.com 25
Connected to smtp-server.smtpdomain.com.
Escape character is ‘^]’.
220 smtp-server.smtpdomain.com plus some other optional server greeting text
You now need to enter your email and then your password encoded in BASE64. Do encode your password use the HCI Data Encoder
mail from: firstname.lastname@example.org
250 Sender accepted.
rcpt to: email@example.com
354 End your message with a period.
Subject: test email
250 Accepted message …
221 Good bye.
Connection closed by foreign host.