How to check if smtp is working from commandline (Linux) [closed]

The syntax for establishing a raw network connection using telnet is this:

telnet {domain_name} {port_number}

So telnet to your SMTP server like

telnet smtp.mydomain.com 25

And copy and paste the below

helo client.mydomain.com

mail from:<[email protected]>

rcpt to:<[email protected]>

数据

From:[email protected]

Subject: test mail from the command line

this is test number 1

sent from the linux box

.

quit

Note:Do not forget the "." at the end which represents the end of the message. The "quit" line exits to end the session