I've recently switched to mutt, but have been using tmux for a year or so now.
Mutt seems to have occasional issues redrawing, for example if I delete a bunch of email using
d and then persist the changes using
$ the list of email doesn't update until I resize the terminal window.
- tmux 1.9a
- mutt 1.5.23
- iTerm2 126.96.36.19941103
I have also noticed redrawing issues using Vim under tmux (more infrequently) and the issue also persists when using the standard OSX terminal instead of iTerm2.