Problems with receving email from outside

My exchange server is Exchange 2010 SP1 and I have spam filtering from MacAfee
before it hits my ord.  XO Communications is our ISP.  

I can Access OWA, I can send an email to the outside world and can send and receive
 from inside the org, but cannot receive emails from outside the organization.

I was able to verify that the MacAfee spam filter can communicate with my exchange server.

What do i need to check?
nsca_mitchAsked:
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
Please have a read of my article about Backpressure - you may have run low on disk space:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_4259-Exchange-2007-2010-Backpressure-Quick-Fix.html

Also check your MX records are pointing to your IP Address that you expect it to and check your IP Address is what you think it is on www.whatismyip.com.

Please also check on www.canyouseeme.org to check port 25 is open and you get a SUCCESS message.
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AustinComputerLabsCommented:
Does Mcafee may require allow anonymous connections be checked on your recieve connector?
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nsca_mitchAuthor Commented:
I am not sure. It has been working fine until a few hours ago.
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Alan HardistyCo-OwnerCommented:
Backpressure will creep up on you suddenly - so don't dismiss it - assuming you are replying to my comment not AustinComputerLabs.
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Alan HardistyCo-OwnerCommented:
Also check your Default Receive connector has Anonymous Permissions enabled.
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AustinComputerLabsCommented:
In the Exchange Management console:
Go to server configuration
Hub Transport
On the bottom right click the recieve connector you set up for Mcafee
Go to the permission groups tab
select anoynmous users click OK.
Then restart exchange transport.
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Alan HardistyCo-OwnerCommented:
So it's not anything to do with McAfee then?
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nsca_mitchAuthor Commented:
I founf the event ID 15006 and 150007 ref backpressure, pursuing that right now.  My Exchange server is all in one, no other servers, where do I restart the edge transport server, or do I just restart the Exchange transport service?
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nsca_mitchAuthor Commented:
You are a life saver!!!!
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