Hey, Avast seems to have created a problem very recently, at least for people like me using Mozilla for email, and Microsoft 365 as an email server. Maybe others.
Somehow, over the weekend, you have changed whatever you insert into the background of outgoing email which creates "bare line feed characters," which are rejected by about one-third of the servers of my intended recipients, beginning this morning.
After a lot of research, I turned off the Avast scan of outgoing email, and the problem ended. But there are threads developing all over the place about this problem which began over the past few days.
Just FYI.
