Re: What is "Got 421 in ESMTP greeting from ..." ?
From: Alan Connor (zzzzzz_at_xxx.yyy)
Date: 02/01/05
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Date: Tue, 01 Feb 2005 21:32:34 GMT
On 31 Jan 2005 06:26:46 -0800, sm5w2@hotmail.com <sm5w2@hotmail.com> wrote:
>
>
> Can someone explain what these errors are?
>
> Got 450 in ESMTP greeting from
> Got 421 in response to EHLO from
> Got 451 in response to EHLO from
> Got 501 in response to HELO from
> Got 504 in response to HELO from
> Got 521 in ESMTP greeting from
> Got 554 in ESMTP greeting from
> Timed out waiting for ESMTP greeting from
> Timed out waiting for SMTP greeting from
> Server closed or timed out in response to EHLO
> Got no response to HELO from
> Got 0 in ESMTP greeting from
>
Looks like you are pretty well covered. Here's a little
exercise that should help you understand the SMTP protocol.
What we are doing is sending a mail manually.
-----------------------
telnet your_isp's_mailserver 25
# that would be something like 'smtp@isp.com' or 'mail.isp.com'
# This assumes that no authentication is required, and it usually
# isn't.
# Wait for the server to respond.
# Enter:
HELO abc.def.ghi
# HELO will work with ESMTP too and the abc.def.ghi is
# arbitrary
# Wait for the server to respond.
# Enter:
MAIL FROM: your@email.address
# Wait for the server to respond.
# Enter:
RCPT TO: someone@whatever.com
# Wait for the server to respond.
# Enter:
DATA
# Wait for the server to respond.
# Enter:
Subject: whatever
# and any other headers you want to add with
# no blank lines between them, then leave a blank
# line then type or paste in your message body
blah blah blah
blah blah blah
# when done, end the message with a '.' alone
# at the beginning of the last line (not shown here)
# followed by a linefeed/carriage return (hit Enter/Return)
# Wait for the server to respond.
#enter
QUIT
# wait for the server to respond and exit telnet
-----------------------------
Note that HELO, etc., don't have to be uppercase.
That's SMTP in a nutshell.
AC
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