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Exchange 2003 intermittant smtp queue, need to force connection

Posted on 2009-06-30
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Last Modified: 2013-11-30
Hi

A problem I would be grateful for some help on

For the last couple of weeks we have had exchange stop sending outgoing messages and issue non delivery reports as below.

There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <XXXXX.co.uk #5.5.0 smtp;550 won't relay to XXXXXXXXX>

I have checked the smtp queue and the messages are stuck there with no message showing in the box at the bottom.  When I use force connection it goes down slowly.  

Exchange is set to "always run"

There is nothing in my groupshield or virusscan logs or event viewer

One clue is it has happened just after i sent about twenty emails that could look like junk.  It happened the same time the week before.  I have tried to disable the intelligent message filter by selecting "take no action" on detected items.  I do not know how to stop the filtering altogether and whether it filters outgoing mail too.

Restarting exchange clears it all and gets it working until the next time

I have attached screen print of the message queue / tracking.

One thing I have noticed is the internet connection wizard and connector shows outgoing smtp server as londonmail.......   whilst screenprint shows mail......  however 98% of all emails go through fine its just it sometimes queues and issues NDR.

I have just noticed noticed this "connection was dropped due to an smtp event sink" on the exchange queue.  I also get this error in the logs

Event Type:      Error
Event Source:      DCOM
Event Category:      None
Event ID:      10009
Date:            30/06/2009
Time:            17:40:45
User:            N/A
Computer:      SERVER01
Description:
DCOM was unable to communicate with the computer mail.XXX.co.uk using any of the configured protocols.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.


Any help appreciated!!!!!





screen-queue1.jpg
screen-queue-2.jpg
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Question by:antalp71
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5 Comments
 
LVL 65

Expert Comment

by:Mestha
ID: 24748327
The error is not an Exchange message. Therefore the remote side is rejecting the message.
Do you send your email directly or via a smart host?

Simon.
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Author Comment

by:antalp71
ID: 24752236
Hi

Thanks for the reply, It was sent via a smart host.  The ISP/Host said there were no problems on their side and they could not see anything.   My smart host is londonmail.xxxxx.co.uk and yet the mail seems to be going to mail.xxxxx.co.uk.  I set it up using the sbs wizard for londonmail and that is what it says in the smtp connector settings.  The old setting was mail.xxx.co.uk.  Can that be residing somewhere still?  Should I speak again to smart host?

Many thanks for the interest.

Ant


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Author Comment

by:antalp71
ID: 24752243
there also seems to be a 10minute delay between "routed and queued" and started "outbound delivery" .  Is that the smart host too.  I have it set up to always run
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LVL 65

Accepted Solution

by:
Mestha earned 2000 total points
ID: 24756021
Message tracking shows you what the remote server has announced itself as, it is quite possible for the server to have another name in its DNS. This quite common where there is a cluster of servers that all answer on the same DNS address - but each one needs to have its own name.

The smart host would seem to be the common cause here - but the ISP will never admit to having a problem.

Simon.
0
 

Author Closing Comment

by:antalp71
ID: 31598411
Thank you, I spoke to smart host, they said they couldnt see any problems their end, but they took a couple of the email subject lines, never heard back but problem seems fixed as emails going through now.  I suspect it was their junk email filters.  Thanks again.
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