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We have Exchange online with Office 365. I am trying to set up a dynamic distribution list of external mail contacts if their address contains a certain email domain. I have tried the powershell script below (as well as the WindowsEmailAddress and EmailAddresses attributes instead of External) but can not get it to work. Anyone know how I could accomplish this? With Exchange Online, it has to be done in Powershell.

Set-DynamicDistributionGroup -Identity "Test Group" -RecipientFilter {((RecipientType -eq 'MailContact') -and -(ExternalEmailAddress -like '@example.com'))}

From what I can tell, the email address filter doesn't seem to be working. The domain is definitely correct. Is there an attribute that can check email addresses for Mail Contacts?

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    There is a "-" in front of "(ExternalEmailAddress [...]" that needs to be removed. When using -like you have to use a wildcard character. Please try ExternalEmailAddress -like '*@example.com'
    – megamorf
    Jun 15, 2015 at 8:16
  • I get "Wildcards cannot be used as the first character. Please revise the filter criteria."
    – SausageBuscuit
    Jun 18, 2015 at 16:07
  • This is absolutely wild that it is 2022 and the wildcards issue is still here. What is Microsoft even doing?
    – Arrow_Raider
    Sep 20, 2022 at 13:53

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I have resorted to using the Company attribute and doing this: 

Set-DynamicDistributionGroup -Identity "Test Group" -RecipientFilter     
{((RecipientType -eq 'MailContact') -and (Company -eq 'Example'))}.

Will be one extra step per person but since that other filter has been so much trouble I'm fine with it.

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