Infralin's (not so) Frequently Asked Questions on Email in general

Gijsbert van der Linden ()
Infralin Consultancy (
    Last updated: 5-4-2005


How to send a message using Telnet?

Bold is what you type 
Italic is optional 
Indented is what is returned
Between [ and ] should/will  be replaced with the appropriate content

Telnet [servername/IP address] 25

220 [hostname] [service name]
ready at [date/time]

ehlo [yourdomainname] 

250-[servername] Hello [IP address]
250-[options supported]
250 OK 

mail from: <[envelop from address]>

250 2.1.0 [envelop from address]....Sender OK 

rcpt to: <[envelop to address]> 

250 2.1.5 [envelop to address] 


 354 Start mail input; end with <CRLF>.<CRLF> 

From: [header from address]

To: [header to addresses]

Subject: [subject]



250 2.6.0 <[message id]> Queued mail for delivery 


221 2.0.0 [servername] Service closing transmission channel 

Connection to host lost.