Howto Telnet SMTP
Table of Contents
Open connection
Command:
telnet mail.domain.tld 25
You should normally receive something like this:
Trying 000.000.000.000...
Say hello
Command:
HELO local.domain
Answer (normally):
250 mail.domain.tld
Set the sender
Command:
MAIL FROM: user@domain.tld
Answer (normally):
250 OK
Set the recipient
Command:
RCPT TO: user@domain.tld
Answer (normally):
250 OK
Compose the message
Command:
DATA
Answer (normally):
354 go ahead
Start writing content in the message
Insert data:
Subject: "Hello World!"
Sending the message
Enter a new line after the last word you have written. Add only a single . (dot) to this line. Hit enter.
.
If everything was ok you should receive a message like this and the mail should be sent:
250 ok 1090795155 qp 29731
That’s it.