Stalwart Mail Server is an open-source Email solution from Stalwart Labs. Compare it against 12 other Email tools on FreeSoftwareX — by features, licensing and price — and request a quote or demo free in 2026.
What is Stalwart Mail Server?
Stalwart Mail Server is open source — its source code is publicly available and free to use, modify and self-host, usually with an active community and no licensing fees. It is categorised under Email and published by Stalwart Labs. Buyers typically evaluate Stalwart Mail Server when they need a dependable Email option and want to weigh the trade-offs between free, open-source and paid tools before committing.
Yes. Stalwart Mail Server is open source and free to use, with no purchase cost for the core product.
What are the best Stalwart Mail Server alternatives?
Popular Email alternatives to Stalwart Mail Server include AnonAddy (addy.io), Maddy Mail Server, Mail-in-a-Box, Mailcow. See the full list of Email on FreeSoftwareX.
What type of software is Stalwart Mail Server?
Stalwart Mail Server is an open-source Email tool developed by Stalwart Labs.
