Some inbound emails not coming to our SBS 2003 Exchange Server.

What can I check on the SBS 2003 Exchange Server to try and find out why some inbound emails are not coming through?  We have a SPAM filter but they are not showing up there either.
Any help will be appreciated.
jmattson30Asked:
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alembic5Commented:
Are they emails from external sources? Are the originators of these emails getting a NDR (non delivery report) back after the attempt?
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SembeeCommented:
As the recipient troubleshooting is almost impossible, particularly as it is just some email coming in.

Until the message actually hits your server you know nothing about it. There are lots of places between the sender and you where the message can be dropped.

The sender needs to show what server the message was delivered to and whether they got any NDR or not.

You could also put your domain in to dnsreport.com and see if you get any errors, but I doubt if this is a DNS problem.

Simon.
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MCPJoeCommented:
Check your network config meaning your router/firewall.  Perhaps it needs a reboot or perhaps your server IP changed for some reason and you need to update your port forwarder.  It could also be that your DNS MX records are not setup correctly.
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NJComputerNetworksCommented:
Your exhcnage server could be blacklisted... check www.dnsstuff.com  to see if you are on a list.
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SembeeCommented:
Black list would have nothing to do with inbound email - that would only affect outbound email unless the original poster is using blacklists.

Simon.
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ollietaitCommented:
I saw an issue with an external spam filtering service - the external filtering service was added to the MX record, they then relayed it to the recipient. The recipient firewall was blocking this as a spoofed attack and the messages were queuing up on the spamfilter servers- check your firewall logs for attacks (this was a sonicwall FW). Oddly most messages came through, but some got blocked as attacks. Reconfigure the firewall to allow the blocked attacks from the IP adddresses of the spam-filter servers.
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