I see 3-10 of these a day. They are all flagged as a blocked threat from the Apple Mail app. The emails are from various sources, most are commercial servers from media publications or computer user groups. I have a hard time believing that Food & Wine Magazine is accidentally bundling malicious viruses in their email newsletters. Also, I am running Avast Mac Security. Is there any actual threat to my Macintosh?
You may ask in avast for Mac forum section
Post a screenshot of the pop up so we can see all info avast give