exchange server named property reached limit

I'm having trouble randomly on my exchange 2003 server. Sometimes, emails stop coming in, it doesn't happen often, maybe once a day or a week. But this shows me something is wrong.
I looked at Application event log, there are multiple same error events;

Failed to create a new named property for database "First Storage Group\Mailbox Store (EXSRV)" because the number of named properties reached the quota limit (8192).
 User attempting to create the named property: "SYSTEM"
 Named property GUID: 00020386-0000-0000-c000-000000000046
 Named property name/id: "Betylinery"

Failed to create a new named property for database "First Storage Group\Mailbox Store (EXSRV)" because the number of named properties reached the quota limit (8192).
 User attempting to create the named property: "SYSTEM"
 Named property GUID: 00020386-0000-0000-c000-000000000046
 Named property name/id: "Jerperlin" '

....


As I guess, the named property is the header information, don't know why incoming emails try to create something like that, maybe my GFI spam filters process the header to exchange server before it's sorted out as spams, which is problem.

Again, I am not sure this is the cause of the problem which makes my server stop working for 10-15 minutes. But this has to be taken care of. How can I block spams not to insert named properties to my server anymore?

Also, does this affect the server and make the server stop working?
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crcsupportAsked:
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Simon Butler (Sembee)ConsultantCommented:
This is a pretty common problem with Exchange 2003. Ultimately there will reach a point where there is nothing more you can do with it, because you will need to move to a new database. Upgrading to a later version of Exchange is the best long term option.

This KB article explains how to increase the limit.
http://support2.microsoft.com/kb/820379

It is your spam filtering software that is causing it. The usual reason is adding something to the headers of the messages to indicate it has been filtered.

Simon.
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
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crcsupportAuthor Commented:
Simon,

"It is your spam filtering software that is causing it. The usual reason is adding something to the headers of the messages to indicate it has been filtered. "

really? ;;;
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Simon Butler (Sembee)ConsultantCommented:
That is usually the cause.
Take a look at the headers of an email and see whether something has been added.

Simon.
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