Trigger rules on time/periodically
I use some labels: "Del after 1 Week", "... 1 Day", ...
Thats very handy for e.g. Newsletters or forum summaries which are out of date if the next one arrives.
But every E-Mail client I know only allows handling those only for incoming messages. The receive event is the trigger. Wouldn't it be nice if I can add a Rule, which is executed, say every day and filters thos labled mails and deletes them, if they're older than 1d or 1w? For every label I would add one rule.

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Ted commented
Yes, please. Seems only logical, especially for the "message is older than X days" criterium.
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KIp Fischer commented
or under the same request a rule that is delayed for x days. I like that i can create a rule an auto file my incoming email, sometimes i need to be able to read the incoming email for up to 72 hours before i want it moved in its folder. Offering a delay option would be awesome.