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exchange 2010 external mail not receiving

Posted on 2011-03-23
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Last Modified: 2012-05-11
I Have a problem that our exchange server over night stoped recieving external email from most of our senders.
the mx record ok.
we using build in exchange spam filter.
on the logs the only msg i see is the content block mail and the internal mail.
the senders are not receiving any return msg.

Thank you for your help
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Question by:nbfl
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Expert Comment

by:Glen Knight
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disable all the Exchange AntiSpam options and see if it makes any difference?

Check the Default receive connector make sure that annonymous users is checked.
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Author Comment

by:nbfl
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hi,
thanks for the reply.
i disabled all spam and the receive connector is allow to annonymous.
everything was working perfect until last night.
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by:Navdeep
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Hi,

can you check your queues if you any queue buildup, how about internal mailflow, is it functional

can you provide the name of your email domain, I can test from external network and try to isolate the problem
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by:Glen Knight
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might be a silly question but have you tried a simple reboot?
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Author Comment

by:nbfl
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hi,
did a reboot, all internal users of the domain are working fine even the one that not in the network (external domain users).
ill rather not give the domain name if posible.

thank you all
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by:nbfl
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no queues build
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by:Glen Knight
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So it's working now?
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by:Glen Knight
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Can you also reboot your router/firewall?

Goto http://whatsmyip.org find your public IP, is it the same one listed if you goto http://mxtoolbox.com and enter your domain name?

What happens when you telnet from outside to to your public IP on port 25?
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by:Navdeep
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yes, you can use mxtoolbox and run smtp diag test.
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Author Comment

by:nbfl
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no.
i have two receive connectors one for port 25 the other for 587 all are set to accept anonymous.
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Author Comment

by:nbfl
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i did the mx tool and both 25 and 587 ok
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by:Glen Knight
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What happens when you telnet from outside to port 25 and send an email via telnet following these instructions: http://support.microsoft.com/kb/153119

Make sure you use valid email addresses.
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by:Navdeep
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so no errors ?

then can you enable protocol logging on receive connector and then send yourself an email from gmail or hotmail , any one will do

then need to check in log if you are getting hit or any failure on wire

also perform message tracking to find if the message came to the server
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Accepted Solution

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nbfl earned 0 total points
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the problemwas a disk space that was eaten by the log files as soon as the disk was cleaned everything back to normal.
now all working!
thank you for your help
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by:Glen Knight
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Ahh! Backpressure!! But if that was the case internal mail wouldn't work either!!

See alanhardisty's guide here on how to prevent this from happening: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_4259-Exchange-2007-2010-Backpressure-Quick-Fix.html
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Author Closing Comment

by:nbfl
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used support from microsoft to solve this
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