OfflineIMAP is a tool to simplify email reading.
It allows you to read the same mailbox from
multiple computers and ensures that your changes
will be automatically reflected on all computers.
You can use various mail clients to read a single
box or read mail while offline with full
synchronization when you reconnect. You can read
IMAP mail with readers that lack IMAP support
(same goes for SSL). OfflineIMAP's multithreaded
synchronization algorithm performs between 10 and
60 times faster than many mail readers' internal
IMAP support, and it can be used even with mail
readers that support IMAP already. There are five
available user interface modules, including
scripted execution, an interactive terminal
interface, and GUI interfaces.