To Whom It May Concern:
I would like to request a rule that deletes a message older than x number of days. You should be able to specify all the existing identifying rules for the message (from email, subject contains, body contains, tag, etc.) as well as specify one of the following: [after reading][only if unread][always] in addition to specifying how many days [after x days].
As an example, you could filter Amazon order confirmation emails and have them deleted from your inbox after 10 days, without having to read them or mark them for deletion (since they appear as messages on my watch). You could also have “special sale - this holiday only” emails from sellers auto-deleted after x number of days, without having to touch them, by setting up the proper ruleset.
Lew