Stalwart
IMAP Server
Open-source Internet Message Access Protocol server designed to be secure, fast, robust and scalable.
Key features
Latest standards
IMAP4rev2 full compliance and compatible with IMAP4rev1.
Multiple Extensions
Supports ManageSieve and dozens of IMAP4 extensions.
Powered by Rust
Incredibly fast while ensuring memory safety. No runtimes or garbage collectors.
Frequently asked questions
If you have a question that is not listed here you may use the contact form below or write to us on Discord.
You can get help from the community by starting a discussion on Github or
Discord. You may also
become a sponsor and get support directly from Stalwart Labs Ltd.
Stalwart IMAP stores all metadata and settings in SQLite or in FoundationDB, a
high
performance
distributed database. E-mail messages are stored separately from metadata,
directly in the file
system using Maildir or alternatively on the S3-storage of your choice.
Contact Stalwart Labs
Have questions about any of our products? Use the form below and we'll get back to you as soon as possible.