Adds some tools to import and export folders and messages
True "Send Later" functionality to schedule the time for sending an email.
This add-on allows you run your message filters automatically on outgoing messages after sending. In other words, it's a outgoing filter for thunderbird and seamonkey.
Batch Copy creates a local copy of your IMAP account, copies all messages and maintains folder structure. Batch Copy can run incrementally to copy only new messages.
Applies mail filters to sub folders of an IMAP account, not just the Inbox