Daily email trojan blocked alerts

I receive an alert from avast every day saying that an email containing a win32-gen trojan has been blocked from my mail app. Is there anyway I can prevent this? I tried blocking mail from the email address but that hasn’t helped. Is my mail app somehow infected? When I scan with Avast and Malwarebytes nothing is found.

Thx.

access your mail account from web and delete the mail, when done empty the deleted folder

Still problem?