Courier Mail Server vs Stalwart Mail Server
Courier Mail Server
courier-mta.org
Stalwart Mail Server
stalwart.emailSide by side
| Figure | Courier Mail Server | 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 | 8 |
| Spec score · Mail Server Software | 8.5 (#1) | 8.0 (#15) |
| Deployment | It can act as an intermediate mail relay, receive mail for multiple domains, or do both. | 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. |
| Integrations | The server can use LDAP, MySQL, or PostgreSQL-based authentication databases and supports LDAP-based mail routing. | 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. |
| Product | Courier is an integrated mail and groupware server providing ESMTP, IMAP, POP3, webmail, and mailing list services. | Stalwart is an open-source mail and collaboration server for email, calendars, contacts, and shared files. |
| Security | Courier supports STARTTLS and SSL for ESMTP, IMAP, POP3, and webmail; its ESMTP client can require a certificate signed by a trusted root CA. | 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
Courier Mail Server
Courier Mail Server 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.