One of the nicer plugins to Gmail (and MS Outlook) is boomerang [1]. It solves the following scenario:
"I'm sending a mail to Bob asking him to perform some task. I expect his response before the work day is over. It's important that I remind him of this task if he doesn't answer my mail in the next 8 hours." My current solution to the problem is writing a note "Follow up Bob" and paste it on my screen. With the boomerang plugin to Outlook or Gmail, I can mark the mail with a timeout of 12 hours. If Bob doesn't reply to my mail, Boomergang move the mail back to my inbox. Anyone heard of a script that does something similar? Do you think it falls under the responsibility of the MUA? [1] http://www.boomeranggmail.com/ -- Jostein