Weird changes to email texts

I used this for a long time and all was OK. However, several months ago it started adding random exclamation marks and spaces to the email text body. I contacted the plugin support but I got no resolution & despite trying they couldn’t duplicate the problem. I ended up switching to “Newsletter” – which has a built in HTML editor/writer for the emails and also has email tarpitting (despatch/scheduling/limits) management built in…