Kolab
6.7#9 in mail server softwareFree planFree planAndroidiOSWebAPI
VisitKolab vs Stalwart Mail Server
Stalwart Mail Server
7.1#4 in mail server softwareFrom $1.09 a yearFree planWebAPILinuxmacOS
VisitWhat both publish
| Fact | Kolab | Stalwart Mail Server |
|---|---|---|
| Deployment | Kolab is packaged as containers that can run on one host or be distributed across a larger environment. | Stalwart can run as one node or as a cluster across regions, and its site describes it as designed to scale to millions of mailboxes. |
| Product | Kolab is a free and open-source communication and collaboration solution that can be run on your own infrastructure. | Stalwart is an open-source mail and collaboration server for email, calendars, contacts, and shared files. |
| Protocols | Kolab supports ActiveSync, IMAP, SMTP, CalDAV and CardDAV for synchronizing email, calendars and tasks. | It supports JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV, and WebDAV. |
| Security | The feature page lists PGP, two-factor authentication, DKIM/DMARC and spam protection among its email security features. | The product page lists mailbox encryption at rest with S/MIME or OpenPGP, DANE, MTA-STS, automatic ACME TLS, DKIM key rotation, access controls, rate limiting, and automatic IP banning. |
Kolab plans
- KolabFree
Stalwart Mail Server plans
- Community EditionFree
- Enterprise — 50,000 to 99,999 mailboxes$1.09 a year
- Enterprise — 10,000 to 49,999 mailboxes$1.25 a year
- Enterprise — 5,000 to 10,000 mailboxes$1.48 a year
- Enterprise — 1,000 to 4,999 mailboxes$1.74 a year
- Enterprise — 500 to 999 mailboxes$2.04 a year
Pick Kolab if…
You want what its maker publishes above — check its page for the details.
Pick Stalwart Mail Server if…
You want what its maker publishes above — check its page for the details.