I am migrating from G Suite to Personal Gmail via POP3 and am getting tons of these messages.
"The message "Subject" from Someone (someone@somewhere) contained a virus or suspicious attachment. It was therefore not fetched from your account firstname.lastname@example.org and has been left on the server.
If you wish to write to Fake Company, just click reply and send Fake Company a message.
The Gmail Team
This wouldn't be an issue if these were all fishy emails but most are legitimate emails (e.g. family, work, friends) that I want to make sure that I'll download so I can access them later on.