Kolab vs Stalwart Mail Server
Kolab
kolab.org
Stalwart Mail Server
stalwart.emailSide by side
| Figure | Kolab | Stalwart Mail Server |
|---|---|---|
| Price from | Free | $0.09/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 8 |
| Spec score · Mail Server Software | 8.0 (#11) | 8.0 (#15) |
| 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. |
Plans
Stalwart Mail Server
- 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
- Enterprise — 25 to 499 mailboxes$2.40 a year
- Enterprise — 100,000 mailboxes and beyondPriced on request
In their own words
Stalwart Mail Server
Stalwart Mail Server has no write-up on Specifiction yet; its figures are above.