SMTP Cheat Sheet
by jcf. Average Reading Time: less than a minute.
From the “my external memory dept”:
One of the simplest way to debug SMTP problems is to talk directly to the SMTP server using a shell (Telnet):
Frodo:~ jcf$ telnet smtp.domain.ch 25
Trying xxx.xxx.xxx.xxx...
Connected to smtp.domain.ch.
Escape character is '^]'.
220 smtp.domain.ch ESMTP ready.
MAIL FROM:name@domain.ch
250 OK
RCPT TO:joe@doe.com
250 Accepted
DATA
354 Enter message, ending with "." on a line by itself
and then the message you want to send (including the headers)
RFC SPEC: “In any event, a client MUST issue HELO or EHLO before starting a mail transaction.”
You forgot EHLO command before MAIL command.