Re: [courier-users] can't get esmtproutes to work

permalink · #1 (**permalink**) 03-07-2008

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You are correct Sam. I was in error. It doesn't have to do with the DATA
being followed immediately by the RCPT TO. Additionally, the k2 server
appears to deal with pipelining just fine. (as seen from the postfix
session).

Here is a dump of 5 mail sessions. 1 from courier sending mail to k2smtpout,
1 from postfix sending to k2smtpout and 3 from me telnetting to the
k2smtpout machine and using different command sequences. This is exactly as
they show up from tcpdump using tcpdump -s0 -w dump.pcap host
k2smtpout.secureserver.net and the output from ethereal Follow TCP Stream,
I haven't changed anything.

Based on what I'm seeing here, it's only courier that's having issues, but
I'll be damned if I can figure out why. It's beyond me.

----------------------------------
COURIER
220 k2smtpout05-01.prod.mesa1.secureserver.net ESMTP
EHLO mail.longboys.net
250-k2smtpout05-01.prod.mesa1.secureserver.net
250-AUTH LOGIN PLAIN
250-8BITMIME
250 PIPELINING
MAIL FROM:<bitman@longboys.net> BODY=7BIT
250 Sender accepted.
RCPT TO:<blong@dga.org>
553 Sorry, that domain isn't in my list of allowed rcpthosts.
--------------------------------------------------
Postfix
220 k2smtpout04-01.prod.mesa1.secureserver.net ESMTP
EHLO mail.longboys.net
250-k2smtpout04-01.prod.mesa1.secureserver.net
250-AUTH LOGIN PLAIN
250-8BITMIME
250 PIPELINING
MAIL FROM:<bitman@longboys.net>
RCPT TO:<blong@dga.org>
DATA
250 Sender accepted.
250 Recipient accepted.
354 End your message with a period.
----------------------------------------

Manual (telnet session)
220 k2smtpout02-01.prod.mesa1.secureserver.net ESMTP
ehlo mail.longboys.net
250-k2smtpout02-01.prod.mesa1.secureserver.net
250-AUTH LOGIN PLAIN
250-8BITMIME
250 PIPELINING
mail from:<bitman@longboys.net> BODY=7BIT
250 Sender accepted.
rcpt to:<blong@dga.org>
250 Recipient accepted.
DATA
354 End your message with a period.
-------------------------------------
Manual Telnet session
220 k2smtpout05-01.prod.mesa1.secureserver.net ESMTP
EHLO mail.longboys.net
250-k2smtpout05-01.prod.mesa1.secureserver.net
250-AUTH LOGIN PLAIN
250-8BITMIME
250 PIPELINING
MAIL FROM:<bitman@longboys.net> BODY=7BIT
250 Sender accepted.
RCPT TO:<blong@dga.org>
250 Recipient accepted.
DATA
354 End your message with a period.
-------------------------------------------
Manual Telnet session
220 k2smtpout05-01.prod.mesa1.secureserver.net ESMTP
EHLO mail.longboys.net
250-k2smtpout05-01.prod.mesa1.secureserver.net
250-AUTH LOGIN PLAIN
250-8BITMIME
250 PIPELINING
MAIL FROM:<bitman@longboys.net> BODY=7BIT
250 Sender accepted.
RCPT TO:<blong@dga.org>
DATA
250 Recipient accepted.
354 End your message with a period.

On Fri, Mar 7, 2008 at 4:02 AM, Sam Varshavchik <mrsam@courier-mta.com>
wrote:

> Bill Long writes:
>
> > It doesn't matter if I understand it or not, Sam. What matters is that I
> > need a mail server running and pointing a finger to and fro isn't going
> to
> > make that happen.
> >
> > I know why it's rejecting the mail. It's because courier is sending the
> > DATA command immediately after sending the RCPT TO command and not
> waiting
> > for the 250 response, and the k2 server is thinking the DATA command is
> > part of the RCPT TO data.
>
> No, it's not. That's not why the server is rejecting the message. I can
> guarantee it. That mail server is Qmail, and that error message is
> returned
> by Qmail when it does not recognize the recipient's domain. Has nothing to
> do with any other reason.
>
>
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> _______________________________________________
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> courier-users@lists.sourceforge.net
> Unsubscribe: https://lists.sourceforge.net/lists/.../courier-users
>
>

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You are correct Sam. I was in error.  It doesn't have to do with the DATA being followed immediately by the RCPT TO. Additionally, the k2 server appears to deal with pipelining just fine. (as seen from the postfix session). 
 Here is a dump of 5 mail sessions. 1 from courier sending mail to k2smtpout, 1 from postfix sending to k2smtpout and 3 from me telnetting to the k2smtpout machine and using different command sequences. This is exactly as they show up from tcpdump using tcpdump -s0 -w dump.pcap host <a href="http://k2smtpout.secureserver.net">k2smtpout.secureserver .net</a>  and the output from ethereal Follow TCP Stream, I haven't changed anything. 
 Based on what I'm seeing here, it's only courier that's having issues, but I'll be damned if I can figure out why. It's beyond me. ---------------------------------- COURIER 220 <a href="http://k2smtpout05-01.prod.mesa1.secureserver.net">k2smtpout05-01.prod.mesa1.secureserver.net</a> ESMTP 
EHLO <a href="http://mail.longboys.net">mail.longboys.net</a> <a href="http://250-k2smtpout05-01.prod.mesa1.secureserver.net">250-k2smtpout05-01.prod.mesa1.secureserver.net</a> 250-AUTH LOGIN PLAIN 250-8BITMIME 
250 PIPELINING MAIL FROM:<<a href="mailto:bitman@longboys.net">bitman@longboys. net</a>> BODY=7BIT 250 Sender accepted. RCPT TO:<<a href="mailto:blong@dga.org">blong@dga.org</a>> 553 Sorry, that domain isn't in my list of allowed rcpthosts. 
-------------------------------------------------- Postfix 220 <a href="http://k2smtpout04-01.prod.mesa1.secureserver.net">k2smtpout04-01.prod.mesa1.secureserver.net</a> ESMTP EHLO <a href="http://mail.longboys.net">mail.longboys.net</a> 
<a href="http://250-k2smtpout04-01.prod.mesa1.secureserver.net">250-k2smtpout04-01.prod.mesa1.secureserver.net</a> 250-AUTH LOGIN PLAIN 250-8BITMIME 250 PIPELINING MAIL FROM:<<a href="mailto:bitman@longboys.net">bitman@longboys. net</a>> 
RCPT TO:<<a href="mailto:blong@dga.org">blong@dga.org</a>> DATA 250 Sender accepted. 250 Recipient accepted. 354 End your message with a period. ---------------------------------------- Manual (telnet session) 
220 <a href="http://k2smtpout02-01.prod.mesa1.secureserver.net">k2smtpout02-01.prod.mesa1.secureserver.net</a> ESMTP ehlo <a href="http://mail.longboys.net">mail.longboys.net</a> <a href="http://250-k2smtpout02-01.prod.mesa1.secureserver.net">250-k2smtpout02-01.prod.mesa1.secureserver.net</a> 
250-AUTH LOGIN PLAIN 250-8BITMIME 250 PIPELINING mail from:<<a href="mailto:bitman@longboys.net">bitman@longboys. net</a>> BODY=7BIT 250 Sender accepted. rcpt to:<<a href="mailto:blong@dga.org">blong@dga.org</a>> 
250 Recipient accepted. DATA 354 End your message with a period. ------------------------------------- Manual Telnet session 220 <a href="http://k2smtpout05-01.prod.mesa1.secureserver.net">k2smtpout05-01.prod.mesa1.secureserver.net</a> ESMTP 
EHLO <a href="http://mail.longboys.net">mail.longboys.net</a> <a href="http://250-k2smtpout05-01.prod.mesa1.secureserver.net">250-k2smtpout05-01.prod.mesa1.secureserver.net</a> 250-AUTH LOGIN PLAIN 250-8BITMIME 
250 PIPELINING MAIL FROM:<<a href="mailto:bitman@longboys.net">bitman@longboys. net</a>> BODY=7BIT 250 Sender accepted. RCPT TO:<<a href="mailto:blong@dga.org">blong@dga.org</a>> 250 Recipient accepted. 
DATA 354 End your message with a period. ------------------------------------------- Manual Telnet session 220 <a href="http://k2smtpout05-01.prod.mesa1.secureserver.net">k2smtpout05-01.prod.mesa1.secureserver.net</a> ESMTP 
EHLO <a href="http://mail.longboys.net">mail.longboys.net</a> <a href="http://250-k2smtpout05-01.prod.mesa1.secureserver.net">250-k2smtpout05-01.prod.mesa1.secureserver.net</a> 250-AUTH LOGIN PLAIN 250-8BITMIME 
250 PIPELINING MAIL FROM:<<a href="mailto:bitman@longboys.net">bitman@longboys. net</a>> BODY=7BIT 250 Sender accepted. RCPT TO:<<a href="mailto:blong@dga.org">blong@dga.org</a>> DATA 250 Recipient accepted. 
354 End your message with a period. 
 <div class="gmail_quote">On Fri, Mar 7, 2008 at 4:02 AM, Sam Varshavchik <<a href="mailto:mrsam@courier-mta.com">mrsam@courier-mta.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">Bill Long writes: 
 
> It doesn't matter if I understand it or not, Sam. What matters is that I 
> need a mail server running and pointing a finger to and fro isn't going to 
> make that happen. 
> 
> I know why it's rejecting the mail. It's because courier is sending the 
> DATA command immediately after sending the RCPT TO command and not waiting 
> for the 250 response, and the k2 server is thinking the DATA command is 
> part of the RCPT TO data. 
 
</div>No, it's not. That's not why the server is rejecting the message. I can 
guarantee it. That mail server is Qmail, and that error message is returned 
by Qmail when it does not recognize the recipient's domain. Has nothing to 
do with any other reason. 
 
 
 
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