Testing an external mail server

There are times when I need to test the basic functionality of an external mail server (i.e. one I don’t control). Here’s a step-by-step process to perform some basic testing using telnet: Telnet to the remote server: telnet <server> 25 If it replies, you should get a response like: Trying <server>… Connected to <FQDN>. Escape character … Read more