I very often have to fight with developers who claim that they are unable to send notifications from their apps. Even after sending them confirmation of a successful telnet, they still argue. This is how I silence the doubt:

Telnet to the server via port 25.

1. Key in “EHLO example.com” and hit enter.

2. Key in “MAIL FROM: sender@domain.com” and hit enter.

3. Key in “RCPT TO: recipient@domain.com” and hit enter.

4. Key in “DATA” and hit enter.

5. Key in your message body and hit enter.

6. Key in ” . ” and press enter.

If you received the mail then your SMTP is working fine.

Reference:
http://thedaneshproject.com/posts/send-mail-through-smtp-using-telnet/

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