Cyrus IMAP vs Stalwart Mail Server
Cyrus IMAP
cyrusimap.org
Stalwart Mail Server
stalwart.emailSide by side
| Figure | Cyrus IMAP | Stalwart Mail Server |
|---|---|---|
| Price from | Free | $0.09/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | — | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | Yes | Yes |
| API | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 16 |
| Spec score · Email Server Software | 8.0 (#8) | 8.0 (#12) |
| Spec score · Mail Server Software | 7.9 (#16) | 8.0 (#15) |
| Integrations | The installation guide describes receiving mail from SMTP servers such as Sendmail, Postfix, and Exim through LMTP. | Listed integrations include LDAP, Active Directory, OIDC, SQL directories, RocksDB, FoundationDB, PostgreSQL, MySQL, SQLite, S3-compatible storage, Azure Blob, and search engines including Meilisearch, Elasticsearch, and OpenSearch. |
| Protocols | Cyrus supports JMAP, IMAP, POP3, CalDAV, and CardDAV. | It supports JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV, and WebDAV. |
| Security | The feature documentation lists Kerberos, LDAP, and SQL authentication, access control, and a sealed system design. | 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
- CommunityFree
- Enterprise: 25–499 mailboxes$2.40 a year
- Enterprise: 500–999 mailboxes$2.04 a year
- Enterprise: 1,000–4,999 mailboxes$1.74 a year
- Enterprise: 5,000–10,000 mailboxes$1.48 a year
- Enterprise: 10,000–49,999 mailboxes$1.25 a year
- Enterprise: 50,000–99,999 mailboxes$1.09 a year
- Enterprise: 100,000+ mailboxesPriced on request
- Community EditionFree
- Enterprise — 50,000 to 99,999 mailboxes$1.09 a year
In their own words
Cyrus IMAP
Cyrus IMAP has no write-up on Specifiction yet; its figures are above.
Stalwart Mail Server
Stalwart Mail Server has no write-up on Specifiction yet; its figures are above.