why there is always message stuck in the queue?

this is exchange 2003 and i found there is always queues stuck there. So I used a test account to test sending and receiving, but I don't have any problem  though. So why some message always stuck there? how can I make them go through? I have tried to force the connection, but it didn't help. Also tried to restart the smtp virtual server also didn't help.
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okamonAsked:
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okamonConnect With a Mentor Author Commented:
found out the problem. It was the metting request issue between exchange 2003 and 2007. Applied the patch fixed the problem.
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Alan HardistyCo-OwnerCommented:
Telnet is not a good test as you may issue the correct commands but different to the automated commands that your server will send when trying to send out mail.

Please have a read of my article and check you are configured properly - you may not be RFC compliant - your Reverse DNS may be incorrect and your FQDN may be wrong:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/A_2427-Problems-sending-mail-to-one-or-more-external-domains.html
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AkhaterCommented:
open the queue and check what kind of messages are these, if you are not facing any issues chances are these will be from postmaster@yourdomain.com to some crazy spammer address or from no sender

in short these would be DSN (Delivery Status Notification) messages and you can ignore them just select all and delete without ndr
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okamonAuthor Commented:
Hi Alan, I have read your article, but I think this probably not issue for me. As we are sending email out through smarthost - MXLOGIC and also our mx record is MXLOGIC and then the mail get delivered to our server.
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okamonAuthor Commented:
and also when I doubled click the connector in the queue, i can see the sender is from our user and it just keep retrying to send out........
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AkhaterCommented:
what is the last error ?
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Alan HardistyCo-OwnerCommented:
So all mail goes out via MXLOGIC and yet some is still stuck in the queue?

What is the destination domain and do you have an SMTP Connector that is configured to send that mail for that domain to another SMARTHOST that is not working?

How many SMTP Connectors do you have?
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okamonAuthor Commented:
we only have 1 smtp connector which route all emails through mxlogic. As ou can see in my screenshot.
and yes, I didn't have problem sending out emails.
I opened one of the message and in the sender, it's from our domain, the receipient is @fastmail.fm (in screnshot)

And I also opened other message, the sender is @hec.ca, recipient is @ourdomain.microsoftonline.com

(this user is on the microsoft exchange online service, our exchange server is in coexistent mode with their service. So all the incoming emails will still be delivered to our server and then get forwarded to microsoft exchange online)
message.jpg
message2.jpg
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Alan HardistyCo-OwnerCommented:
Okay - I think it is time to take a step back and ask you to fully describe your environment and email flow (in and out) so that I can understand what you have and what the problem might be.

Thanks

Alan
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okamonAuthor Commented:
the environment is running exchange 2003 and DC is on another server.And all emails route through mxlogic, also the incoming email. We currently decided to go with microsoft exchange online, so some users are on the new service while others still on local exchange. So we are now in co-existent mode with MS exchange online which works as all the incoming emails will still be delivered to on premise exchange and then if the users has been migrated, local exchange will pass to the MS exchange online. I see that after I run the user migration tool, it actually created a contact as user@domain.microsoftonline.com and then in the user's profile, deliver option, i see the forward to that contact. So basically this is how co-existent mode works. But I think there is nothing to do with the mail that stuck in the queue. As if the user been switched to exchange online, when they send emails, they actually send using MS exchange online smtp not ours...
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okamonAuthor Commented:
Hi Alan, just a quick update. I created another smtp connector as load balance and use the DNS to route the message. As soon as the second connector cretaed, the queue clean up itself. All message went out successfully..... Do you know what is causing the problem? There was not thousand of emails get sent at same time though, I though usually 1 smtp connector would be enough...
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Alan HardistyCo-OwnerCommented:
You could have a problem connector or the FQDN on the original one might be incorrect.  It does seem weird to me though.
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okamonAuthor Commented:
the original one is configured to use the mxlogic smart host. Here is the screenshot. Other setting I just left default. Probably there is problem on mxlogic end?
mxlogic.jpg
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Alan HardistyCo-OwnerCommented:
It does sound like a problem with MXLogic - not your end.  Have you tried a different Smarthost of theirs?
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okamonAuthor Commented:
no, but I doubt if it's mxlogic issue... as the message never leave the local exchange server though, it's in the queue. I tired to delete the oldest message in queue folder and it seems now all mails go through smoothly... maybe the oldest mail clog up?
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Alan HardistyCo-OwnerCommented:
How big was the message?  Perhaps it was too big?
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okamonAuthor Commented:
sorry for the late reply. The biggest one I see there is 10782 bytes
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okamonAuthor Commented:
found solution
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