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JHMarshIII

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Good Inbound Email Not Getting In - Where Do I Start To Look?

Where does one look to see what messages Exchange is handling before it hits the mail boxes?

Yesterday or sometime over the weekend our office stopped getting legitimate e-mail.  We can send internal mail to each other and out of the office, but are not getting anything coming in.  Except that the IMF is installed and shows is catching lot's of SPAM.
 
All the queues are at 0 and outsiders are not reporting getting bounces or warnings.

Over the weekend a couple of  workstations where upgraded  from Outlook 2003 SP none  to SP3 but we didn't touch the server.   Use Cached Exchange mode was checked on those upgraded machines.
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peakpeak
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JHMarshIII

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PeakPeak,  thanks for that tip.   I checked and see that Message Tracking is enabled with it set to purge after 15 days.   I  did a few searches for inbound test messages that I send from an outside domain to myself (GMAIL, .mac) but could not find them in the queues.

I see a Diagnostic Logging tab that has dozens of options too.  But the logging level is none on all of them.  

And of course IMF is still cranking trapping inbound SPAM but I don't see any legit messages caught up in its net.

Any other ideas?
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Michael Worsham
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Another couple of options...

Check that the fully qualified domain name (FQDN) for the SMTP Virtual Server is valid. It's pretty common for servers to check for valid FQDN's before accepting delivery. See the settings on the SMTP Virtual Server->Delivery tab->Advanced.

Another idea is to raise the diagnostic logging level. You do that by setting a suitable level in Exchange System Manager->your server->Diagnostic Logging->MSExchangeTransport. Enable the ConnectionManager and SMTP Protocol categories to start with.
Another option is to send an email to your server manually through Telnet.
Are internal mail working as it should? If so then use Telnet from outside.
http://www.yuki-onna.co.uk/email/smtp.html
MX Record Dropped

It turns out that an unauthorized DNS change was made to a new DNS server that lacked a MX record.  However, the steps suggested by both "peakpeak" and "mwecomputers" were most useful in helping to realize this.
A good site to use for checking DNS records is either DNSStuff.com or IntoDNS.com. These sites can scan your DNS entries as well as the MX records and see if there are underlying issues with your Exchange environment (i.e. open relays, etc).