Sherif Soliman wrote (at 22:58 on 15 Feb 2019):

This is something that MailMate does to help users detect @ symbols in the name part of an address header, which is one simple pattern of email spoofing. This blog post by Benny explains more:

https://blog.freron.com/2017/email-spoofing/

Thank you, Sherif, for finding and linking to the blog post!
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