Re: Error 550 5.7.1. messsage refused
From: Rich Matheisen [MVP] (richnews_at_rmcons.com.NOSPAM.COM)
Date: 02/13/05
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Date: Sun, 13 Feb 2005 17:11:04 -0500
"T. Uranjek" <toniuranjek@hotmail.com> wrote:
>Rich, thanx for your answers,
>
>Diagnostic Logging, MSExchangeTransport, Categorizer and SMTP protocol
>logging levels are now set to maximum, all others from Transport service to
>minimum.
>
>There were two attempts to send this message, and communication beetwen
>servers was established in both caseses.
"Established" doesn't mean a whole lot. SMTP isn't part of the IP
protocol stack. What you want to see is a successful completion of the
SMTP conversation/transaction.
>We don't use any relay servers, this is one and only Exchange server behind
>firewall box with SMTP traffic completly open. This firewall is not Pix. I
>found KB article which explains similar behaviour if you are using Exchange
>behind Pix.
>
>I've double cheked our MX record with www.dnsreport.com and www.dnsstuff.com
>and I couldn't find any problem.
Consider that the problem may not be your server at all! If you see a
successful conclusion to the conversation/transaction in your SMTP
logs then it's time to ask the other end of the connection about what
they see in their logs. And don't forget that the world is full of
broken stuff.
>We were using ISP's mail server to serve as
>backup, if our connection would drop. Second MX record was removed from DNS
>on 1st of February, one day after log I've posted was made.
Ummm . . . and what was the TTL on that/those DNS resource records?
That data might be cached on untold numbers of DNS servers all over
the Internet -- and if you count the broken stuff that never refreshes
a cached lookup (like the Exchange 5.5 IMS) you might be spinning your
wheels looking for problems.
Before you remove a DNS resource record, shorten its TTL and then wait
until the original TTL expires (plus the new TTL) before removing the
DNS RR.
>Now that I'm looking thoroughly at SMTP log, I see that with all refused
>messages DATA part is missing, and all these messages were sent from abroad.
>Is this communication problem?
It could be anything. Keep in mind that you're dealing with the
Internet and not your LAN. There's plenty of stuff that doesn't work
right and it's not your job to fix it all. TCP/IP and SMTP are robust
protocols. If a connection fails a retry is made--several of them in
fact--at multiple places within the IP stack and the SMTP protocol. If
you have continuous problems for all IP addresses and networks then
it's probably your fault or the ISP's fault. If only a few places fail
then it's not usually worth the effort to find out why unless someone
complains.
Not to sound cavalier, but e-mail is only one means of communication.
The telephone still works. There's IM and, if you're really in a bind,
there's snail-mail and courier services. If you don't get your daily
ration of spam from an open SMTP relay server in Korea or China, does
it really matter?
-- Rich Matheisen MCSE+I, Exchange MVP MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm
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