Occasionally I’ve had to troubleshoot sending email messages to a particular SMTP server by simulating a mail client (or .NET mail code) by using the telnet client. Here’s how I do it on Windows:
- Open the command prompt
- type:
telnet smtpserver.domain.com 25 <press enter> - type:
helo server.com <press enter> - type:
mail from: you@domain.com <press enter> - type:
rcpt to: someone@domain.com <press enter> - type:
data <press enter> - Write a test message. Typically, I type something like:
hello world! <press enter> - To send the message, type a single period (
.) on a line by itself and of course, press enter
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
