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Old 15 Dec 2018, 03:33 PM   #5
BritTim
The "e" in e-mail
 
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,095
You can create a rule based on the To alias and the X-Mailer header.

Go to Settings->Rules, click New rule, and use
Code:
If all of the following conditions apply
Any recipient email  is exactly  <the desired alias>
(Add condition)
Code:
A header called  X-Mailer  begins with  MailChimp Mailer
Under Action select
Permanently delete the message

Then click Save
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