Exchange not sending SMTP quit command or remote server not accepting it...?

We are having an intermintent problem sending to a domain. I have been in touch with the domain and they claim the issue is that their servers do not receieve a quit command from our exchange server. They say they have never seen this issue before and are not sure how to fix it. Any one have any ideas why our Exchange server either is not sending a quit command or the remote server is not getting it?

My firewall does not block anything Exchange sends out... So is it possible Exchange just isn't sending this command?
BigZWillisAsked:
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avilovCommented:
Just to clear it, I would install sniffer behind the firewall and inspect the several SMTP sessions with the server from that domain.

That way you'll know for sure what and when is sent.

you can use wireshark  ( http://www.wireshark.org ) for sniffing and inspection
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BigZWillisAuthor Commented:
Will do... Not sure if I will be able to determine the results but I will post back here.
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SembeeCommented:
It will not be Exchange doing this - most likely third party interference. The classic causes are firewall, antivirus and antispam software.

Simon.
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avilovCommented:
I would agree. the thing that is strange, that is that happens only with one external domain. That is why it always good to have all own checks done before requesting them to fix their side
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BigZWillisAuthor Commented:
So I did a port scan and the server is in fact sending out a quit command... So this must be an issue on their end?
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avilovCommented:
yes, that is probably them. contact them and provide all info you got (if they ask :) ) they should check their end
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