[MlMt] Auto delete old messages that have a certain tag?

[Roger Bohn]

Hi everyone,
I want to throw away certain old messages after a specified time. But I 
want to use tags to set which messages get this treatment. In process 
terms:

* Message arrives, goes into an assigned mailbox.
* I read it
* I decide it should be kept until some condition or event happens, then 
thrown away. For now, the event is “the message is more than a month 
old.”
* I set a tag “DELETE30” on the message.
* The message remains in its regular mailbox.
* After 30 days, the message is automatically deleted from the mailbox.

How can I do this?
It’s easy to create a Smart Mailbox with messages that have tag 
DELETE30 and “Date Is Not Within Last 30 days” , using Conditions. 
But Conditions do not create actions, if I understand them. Rules carry 
out actions, but rules are only executed when a message is processed for 
other reasons.

For example, is there a way to automatically delete messages in a 
particular Smart Mailbox, once a day?

thanks for any suggestions. Drafting this message has clarified my 
thinking, but not led to a solution.]
Roger

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