"JJ" <JJ@newsgroup> wrote in message
> Today noticed large email queue on SBS2003, cannot send emails to any
> outside domain, and in addiditional queue information i see this message -
> The connection was dropped due to an SMTP protocol event sink.
> Our SBS2003 is used for email recieving and sending, no external smart
> hosts and server is behind firewall. Looks like our internal AD DNS is
> working fine, i can recieve recrusive answers from DNS(cheked with
> also i can connect with telnet to port 25 to any mail server in queue,
> also i
> can connect to my server from interet with telnet on port 25. I enabled
> diagnostic logging for ms exchange transport and in event log saw these
> messages: "Message delivery to the host xxx.xxx.xx.xx failed while
> to the remote domain 'domain.eu' for the following reason: The connection
> was dropped due to an SMTP protocol event sink.
> The SMTP verb which caused the error is 'quit'. The response from the
> remote server is ''.
> Of course i restarted server few times, but no changes, also cheked our
> MX and PTR records at ISP DNS, and our external ip isn't listed in any
> Uninstalled antivirus software from server, because some people had
> problems from antivirus.
The Event sink portion seems to be indicating a third party Exchange app is
installed. It could be an antivirus, XClaimer, etc. What is installed on the
Are you getting EventID 2012 or 2013 errors?
Is this happening with normal domains that you send to, or ones you do not
recognize? You could be under an attack someone trying to relay through your
One thing I did find when I searched on this error, is the following quote
from Exchange-experts.com. http://www.experts-exchange.com/Netw..._21110083.html
He didn't indicate it, but my guess his issue may have been that the
Exchange folders were not excluded from the antivirus scanning.
"i fixed this. disabling the anti-virus, re-installing smtp, then
re-installing exchange. bout 12 hours now. wanted to thank everyone for
their help with this so i split the points. "
This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.
Please reply back to the newsgroup or forum for collaboration benefit among
responding engineers, and to help others benefit from your resolution.
Ace Fekay, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE & MCSA
2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
For urgent issues, please contact Microsoft PSS directly. Please check http://support.microsoft.com
for regional support phone numbers.