tanstaafl wrote:I'm not aware of a easy way to keep them in sync. You could create a virtual folder using saved search that acts as if it contains the contents of both folders. That would make it a little easier to delete both copies at the same time. I'm not sure its worth the complexity. See http://kb.mozillazine.org/Saved_Search
Have you considered using message aging per http://kb.mozillazine.org/Message_aging to limit how long messages can stay in the Gmail sent mail folder before they are automatically deleted? Warning - that feature permanently deletes messages - it doesn't move them to the trash etc.
Appreciate the help. I think youre right about avoiding the complexity of doing that. Not worth it as you said. I'll leave this as is.
Yes I have looked into that message aging. I'd rather keep my messages until I decide to delete them. But thanks for that heads up. I might use it one day.