8,329 questions
Shouldn't that filter look like this?
EmailAddresses -like 'SMTP:*@keyman .com'
Is it possible that all your domains are similar and they all end in "domain.com"? E.g. sub1.domain.com, sub2.domain.com, and domain.com. Or ABCdomain.com, DEFdomain.com, and domain.com,
This more of an Exchange question than a PowerShell question.