No, because /tmp is supposed to be assumed to be cleared on start up. If you want something to survive between reboots, /tmp is the last place you should put it

No, because /tmp is supposed to be assumed to be cleared on start up. If you want something to survive between reboots, /tmp is the last place you should put it, even if you're not using tmpfs. I've never had a problem with this using mutt, but if I cared, I'd switch it to use /var/tmp. Either way, if there's a problem, it's with the program, not the filesystem - no need to use a cannon to kill a fly.