I've just started using Thunderbird instead of web mail because I'd like the ability to view and send emails offline.
I currently have it connected to Gmail using IMAP, but in order to sync I have to manually select sync from File > Offline > Download/Sync Now , and even then it appears to still download the entire inbox instead of just the recent ones.
How can I automatically keep the last 90 days worth of mail on my computer without deleting anything from the server?
These are my current Synchronization & Storage settings but they don't appear to do much:
And here are the Server Settings: