Aug 15, '03 10:25:00AM • Contributed by: Anonymous
You can compromise between deleting messages older than one month and never by editing com.apple.mail.plist in your ~/Library -> Preferences folder. Using the Property List Editor (double-click on the property list file), look under Mail Accounts for NumberofDaystoKeepSentMessages, and change it to the number of days you want-- I chose 90. You can also change the values for your Junk Mail and Deleted Messages folders, too.
