certain email domains being blocked from our exchange 2010

We have an exchange 2010 server and one of our vendors is suddenly getting blocked. I installed the anti-spam plugin and haven't added much of anything except a few words to be blocked in the content filtering section. Is there a way to add a domain exception to the list?
ETI2010Asked:
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praveenkumare_spCommented:
have u added the domain in the accepted domains under the hub transport server
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praveenkumare_spCommented:
Go to EMC >ORG configuration >Hub transport > accepted domains

check whether u have the domain over there
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Suliman Abu KharroubIT Consultant Commented:
@praveenkumare_sp:

how would adding accepted domain help in this situation?
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praveenkumare_spCommented:
i am not a wizard as ur but if the domains of the vvendor is not in accepted domain , wont u have this issue ??
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Suliman Abu KharroubIT Consultant Commented:
Wizard is not a big deal, just ignore it :)

Accepted domains are used when you need to relay domain ( internal, external or authoritative domains).
http://technet.microsoft.com/en-us/library/bb124423.aspx
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praveenkumare_spCommented:
Got ya ,,, thanks for the info
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Suliman Abu KharroubIT Consultant Commented:
You welcome :)
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ETI2010Author Commented:
I used mxtoolbox to find the IP address of the senders and added them to the IP Allow List.
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