offlineimap

OfflineIMAP is a command line tool designed to synchronize emails between a local mailbox and a remote mailbox. It allows users to access their emails while offline and perform operations such as reading, sending, and managing messages.

The tool supports various protocols, including IMAP and POP, allowing it to work with popular email providers like Gmail, Yahoo, and Outlook. It uses a two-way synchronization method, allowing changes made in either mailbox to be reflected in the other.

OfflineIMAP provides several configuration options to customize its behavior, such as defining which mailboxes to sync, setting up filters to exclude certain folders or messages, and specifying the frequency of synchronization.

It stores email copies locally in the Maildir format, which offers easy access and manipulation of individual messages. Users can browse and search their synchronized emails using any mail client that supports Maildir, even without an internet connection.

The tool supports incremental synchronization, which means it only downloads new or modified messages, resulting in faster and more efficient synchronization.

OfflineIMAP has built-in mechanisms to handle network disruptions and interruptions while synchronizing, ensuring the process resumes and completes without data loss.

It provides extensive logging and error reporting, allowing users to troubleshoot any configuration or synchronization issues effectively.

OfflineIMAP is free and open-source software, distributed under the GNU General Public License (GPL). This allows users to examine its source code, modify it, and contribute to its development if desired.

The tool is highly customizable, providing advanced features like multiple account support, SSL/TLS encryption, compression, and proxy server integration.

OfflineIMAP has a supportive community, with active mailing lists and forums where users can seek help, share tips and tricks, and collaborate on improving the tool.