I just noticed this since upgrading to 10.3.5 last week, but it seems my Mail.app 1.3.9 (v.619) has stopped copying messages I send to my "Sent" folder. No idea why. I repaired permissions (no problems found) and even deleted several hundred old "sent" emails to reduce the archive file size. No difference. (The emails all go where they're supposed to, no issues there, it just doesn't save a copy for me anymore!) Of course I cannot positively link this behaviour to 10.3.5 but there was never a problem before that. Any other users experienced this? Any thoughts? Thanks!