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SPECIFICTION
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Postfix vs Stalwart Mail Server

Postfix

postfix.org

Stalwart Mail Server

stalwart.email

Side by side

FigurePostfixStalwart Mail Server
Price from—$0.09/mo
Free plan—Yes
Free trial—Yes
Open source——
Web—Yes
Windows—Yes
macOSYesYes
LinuxYesYes
API—Yes
Self-hostedYesYes
Plans published016
Spec score · Email Server Software7.2 (#21)8.0 (#12)
Spec score · Mail Server Software7.2 (#30)8.0 (#15)
DeploymentPostfix is built from source and runs on UNIX-like systems; operating-system and appliance vendors also distribute ready-to-run versions.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.
IntegrationsThe add-on directory lists third-party tools for authentication, content filtering, policy services, webmail, and other functions; entries are maintained by their authors without formal evaluation.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.
ProductPostfix is Wietse Venema’s mail server, created as an alternative to Sendmail.Stalwart is an open-source mail and collaboration server for email, calendars, contacts, and shared files.

Plans

Postfix

No plans published.

Postfix pricing →

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

Stalwart Mail Server pricing →

In their own words

Postfix

Postfix has no write-up on Specifiction yet; its figures are above.

Visit postfix.org

Stalwart Mail Server

Stalwart Mail Server has no write-up on Specifiction yet; its figures are above.

Visit stalwart.email