Nice hint, THANK YOU! I saved 122,432 Kb after rebuilding all the indices (…by searching the entire message of all mailboxes for the letter a, quit Mail and checked the disk usage, then relaunched Mail and clicked on each mailbox--waiting until the Activity Viewer window was finished before clicking on the next folder. Not much change in size, only a few k, so I guess searching the entire content of all messages did the trick of rebuilding the indices).

Before:

$ du -ks ~/Library/Mail
710408    ~/Library/Mail

After:

$ du -ks ~/Library/Mail
587976    ~/Library/Mail

Running 10.3.7, Mail(.app) 1.3 (v606/619).

Strange thing is, "find" no longer finds any SKindex files. So far all is fine though and searches work (I really deleted all deleted messages beforehand).

Maybe the SKindex files are no longer used in 10.3's Mail?--and they were just sitting there all this time wasting space?

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