No longer recieving external emails

External emails have ceased to come in.  We can telnet into our server but the emails are not coming in.  Internal emails are processing fine as well as outgoing emails.  All exchange services are on.  All anti-spam is turned off.  Any suggestions?
kalkroAsked:
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kieran_bCommented:
Can you put your domain in here and tell us the error? -> http://www.zmailer.org/mxverify.html
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kalkroAuthor Commented:
Ip to our box is uhura.vic.edu.  We are not getting any error messages, not bounce back messages, just not email.
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kieran_bCommented:
Your server is answering, but taking a rediculously long time to accept mail.

You say that all Anti-Spam is turned off, what about Anti-Virus?

Have you enabled tarpitting?
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kalkroAuthor Commented:
I'm sorry I didnt understand what you wanted there.  I just ran the test and there were no errors.  It said :

Testing server at address: IPv4 216.184.75.99
[ CONNECTED! ]
 220 uhura.vic.edu Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready at  Mon, 28 Jan 2008 16:10:47 -0500
 EHLO z2.cat.iki.fi
 250-uhura.vic.edu Hello [212.16.98.133]
 250-TURN
 250-SIZE 10485760
 250-ETRN
 250-PIPELINING
 250-DSN
 250-ENHANCEDSTATUSCODES
 250-8bitmime
 250-BINARYMIME
 250-CHUNKING
 250-VRFY
 250-X-EXPS GSSAPI NTLM LOGIN
 250-X-EXPS=LOGIN
 250-AUTH GSSAPI NTLM LOGIN
 250-AUTH=LOGIN
 250-X-LINK2STATE
 250-XEXCH50
 250 OK
Excellent! It speaks ESMTP!

 MAIL FROM:<>
 250 2.1.0 <>....Sender OK

Fine, it accepts NULL return-path as is mandated by RFC 2821 section 6.1
 RSET
 250 2.0.0 Resetting
 MAIL FROM:<postmaster@z2.cat.iki.fi>
 250 2.1.0 postmaster@z2.cat.iki.fi....Sender OK
 RCPT TO:<tonyturner@vic.edu>
 250 2.1.5 tonyturner@vic.edu
 RCPT TO:<postmaster@vic.edu>
 550 5.1.1 User unknown
Eh ? What ? No ``postmaster'' supported there ? That violates RFC 2821 section 4.5.1.
Apparently OK!
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kalkroAuthor Commented:
I have turned both spam and anti virus off.  No tarpitting.
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kieran_bCommented:
OK, well your test with a real email address worked - so your server is working from the outside world, meaning the problem is on the server itself.

Use message tracking to find out what is happening to the messages

http://www.msexchange.org/tutorials/Exchange-2003-Message-Tracking-Logging.html

Kieran
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kalkroAuthor Commented:
That is what we are quessing too.  They are not showing up for tracking.  
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kieran_bCommented:
If they are not showing up in tracking, then you either have tracking disabled, or the AV/AS is getting in the way.  Sometimes anti-virus and anti-spam doesnt just let you disable it, it needs to be uninstalled.

Kieran
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Computer101Commented:
Forced accept.

Computer101
EE Admin
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