Hi @桐 梧 ,
Welcome!
Outlook VBA develop issue, so I add the "office-vba-dev" tag here to better help solve your issue.
I tried some search and found some existed VBA scripts which might could help, for your reference:
Sending Email to a List of Recipients Using Excel and Outlook
How to Send a Same Email to Each Member in an Outlook Contact Group Separately via VBA
(Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Hope this can be helpful.
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