I use gmail, which is BY FAR the world's most popular email service, by a country mile.

I have default settings. I've never even opened the settings window, I wouldn't know where to find it or what it looks like.

I press the reply button, type words, and press send.

If this doesn't work, then the bug is in the custom forum software. I suggest you address a bug report to the author.

I can't seriously be the only person here that uses gmail? ...if that's true; that really says something about the ambient autism score in this room...