InterIMAP synchronizes emails and their metadata between a remote IMAP server and local storage. By leveraging the Quick Mailbox Resynchronization IMAP extension, it can offer much better performance than tools such as OfflineIMAP.

PullIMAP retrieves messages from an IMAP mailbox and deliver them locally. It can use the the IDLE IMAP extension to reduce both latency and network traffic.

General documentation

• Getting started with InterIMAP
• Multi-remote setup for InterIMAP
• InterIMAP benchmark metrics and comparison
• Presentation at DebConf19

Manuals (HTML versions)

• interimap(1) — Fast bidirectional synchronization for IMAP servers
• pullimap(1) — Pull mails from an IMAP mailbox and deliver them to an SMTP session

Resources for developers

• Source-code repository
• Build instructions
• Test environment setup