Tons of spam from .US addresses. How to block but allow legitimate .us address through?

Hello all
Exchange 2010 on-premise. I don't have the budget to sign up with a spam filter service so I'm struggling with using Exchange's built-in spam filtering.
I've been monitoring user's inbox reporting high volume of spam. The one consistency is that the addresses end with .us
Problem is, we have some customers using .us e-mail addresses.
The spam email with .us changes daily. Meaning one day spam address might be amazondeals.us next day it's amazon-deals.us
I can't keep up with all the variations. Is there a way to block .us but allow the legitimate ones?

Hi,
According to your description, I understand that you want to block .us address suffix also allow the legitimate ones.
If I misunderstand you concern, please do not hesitate to let me know.
How you deploy spam and anti in your environment, sender filter? More details about Anti-Spam and Antivirus Mail Flow, for your reference:
https://technet.microsoft.com/en-us/library/aa997242(v=exchg.141).aspx
Regardless of what you are building spam filter, please add Whatif parameter. For example:
Set-SenderFilterConfig -BlankSenderBlockingEnabled $true -BlockedDomainsAndSubdomains * amazondeals.us -Whatif “a@ amazondeals.us”
Thanks
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Allen Wang
TechNet Community Support

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Tons of spam from .US addresses. How to block but allow legitimate .us address through?

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