SMTP Mail Test Via Telnet Commands

You are here:
< Back

Many times, when e-mail breaks, the fastest way to troubleshoot and find out what’s breaking is to establish a connection to your mail server via telnet and send commands to see how the server responds.

– Start, Run, type “cmd”
– Type – “telnet 25” hit the [ENTER] key
– Server responds with: 220 xx.domain.com SMTP
– Type – “HELO” hit the [ENTER] key. In some instances you might have to type “HELO mail.domain.com”.
– Server responds with: 250 OK
– Type – “MAIL FROM:user@domain1.com” hit the [ENTER] key
– Server responds with: 250 user@domain1.com
– Type – “RCPT TO:user:@domain2.com” hit the [ENTER] key
– Server responds with: 250 user@domain2.com
– Type “DATA” hit the [ENTER] key
– Server Responds (or may not): 354 Enter Mail.
– Enter/type your message hit the [ENTER] key
– Hit [ENTER] for a new line then type “.” (period) when done with the message
– Type “exit” then [ENTER]

Previous Microsoft Windows Workstation Life Cycle
Next Things to try before calling support