Allow one External User in Office 365 to send email to a Distribution list

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I'm a global administrator of my O365 account - I have an external user who is not in our O365 contact list and needs to send email to one of our O365 distribution group and I don't want to check mark on "allow external user to send to this Distribution list" as I don't want every external user send to that distribution list - my question is how do I can grant permission just to that one external user to send email to the distribution list who is not added as an O365 contact and where distribution list has a restriction to not receive email from external users.

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