On 2/13/2008 Benjamin R. Haskell wrote:
Depends on the context for me. If it's in a spam folder, I'd rather not keep it around any longer than it'd take for someone to say "Hey, didn't you get that?". So -mtime +13 (2 weeks from receipt). (Thanks for the heads-up on +13 vs. +14, btw).
Trash on the other hand, seems like you'd want X to be "about a month" in: "Oh, no! I accidentally deleted that thing X ago!", since messages tend to stick around for a while in the INBOX. (Note the difference: "Oh, no! I accidentally deleted that thing that *arrived* X ago!".) So, -ctime +30 (trashed more than a month ago).
Re-scanning this thread, no one ever mentions what version, so, since no one's mentioned it yet - the 'Expire' plugin is made for this, and would be a good reason to move to 1.1 tree, if you're comfortable running non-release/RC versions...