New-TransportRule how to block country?

Question

Hi. Exchange 2019 on-premise.

For example: user@contoso.com

How can I block all mail flow if the sender address has .com in it ?

I need set '.com' or 'com' for -SenderDomainIs ?

I see in the description of this property that it takes a "word" parameter, but I don't understand how it checks. In the examples only sub domains, for example contoso.com, how can I block a country by the first level of the domain ?

Answer 1

Hi @Андрей Михалевский,

Please create a rule with the following cmdlet and see if it works for you:

New-TransportRule -Name "block TLD .com" -FromAddressMatchesPatterns "\w+@\w+\.com$" -RejectMessageReasonText "blocked" -StopRuleProcessing $true

This regax (\w+@\w+.com$) will check if the sender email address ends with .com.

If yes, the rule will block the email.

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