How to manually test SMTP Authentication

Last Updated on Saturday, 19 December 2009 02:06 Written by Shai Ben-Naphtali Saturday, 19 December 2009 12:13

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Sometimes, you find yourself not knowing if you have the right credentials to do SMTP Authentication. This might be because your mail client that you are so used to, is just a GUI (Graphic User Interface) for doing things the easy way. In this blog, I’ll show you (a bit of) what your mail client does in order to authenticate and send an email via an SMTP server/service.

This guide, with just using telnet, will allow you to test if you can even do SMTP on port 25 from within your LAN/Organization or behind your Anti-Virus/Firewall.