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Exchange SmtpReceive

Can someone help me on on an issue please,

I'm currently getting a lot of warning with the below event.   I have already enabled verbose logging on both the send and receive connector, but I am a bit confused of what i'll need to look at in the logs. If someone can point me in the right direction that would be great.
( we are running exchange enterprise SP2 )

event ID 1010 - Category SmtpReceive

The account 'NT AUTHORITY\ANONYMOUS LOGON' provided valid credentials, but is not authorized to use the server; failing authentication
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Most Valuable Expert 2014
If the tags are correct - then Exchange 2010 SP2 is no longer supported. You need to upgrade to Exchange 2010 SP3 with the latest rollup.

Anonymous logon is how email is delivered. Therefore that suggest that one of your connectors has anonymous permission enabled when it shouldn't do, or something is trying to use it when it shouldn't be.

Anonymous needs to be enabled on the Default connector only for most implementations. You cannot turn it off completely, otherwise email cannot be delivered to the server from the internet.