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Tools | Options | Advanced | Config editor

mail.check_all_imap_folders_for_new true
mail.imap.expunge_after_delete true

Usefull plugins:

• ConfigDate
• Duplicate Contact Manager
• Enigmail - PGP/GPG plugin
• PGP/GPG package
• Lightning - calendar
• Mail redirect
• Quote colors

*Remove duplicate messages

• Remove duplicate messages
• Sync on arrival
• Virtual Identity
• Xpunge