SM

Email Server Software

Stalwart Mail Server

stalwart.email · checked 30 Sept 2026

#5 · Email Server Software#8 · Mail Server Software
Visit stalwart.email ↗ Alternatives Stalwart Mail Server vs SmarterMail

How it plugs in

—Public API
NoOpen source
YesFree tier

Signal on Email Server Software6.3#5 of 33

Stalwart is an open-source mail and collaboration server for email, calendars, contacts, and shared files.

Stalwart Mail Server home page

Pricing

  • CommunityFree under AGPL-3.0 · AGPL-3.0 licensed · Self-hosted deployment · Standard mail and collaboration protocolsFree
  • Enterprise: 25–499 mailboxesAnnual rate; tiered pricing · 25–499 mailboxes$2.40/yr
  • Enterprise: 500–999 mailboxesAnnual rate; tiered pricing · 500–999 mailboxes$2.04/yr
  • Enterprise: 1,000–4,999 mailboxesAnnual rate; tiered pricing · 1,000–4,999 mailboxes$1.74/yr
  • Enterprise: 5,000–10,000 mailboxesAnnual rate; tiered pricing · 5,000–10,000 mailboxes$1.48/yr
  • Enterprise: 10,000–49,999 mailboxesAnnual rate; tiered pricing · 10,000–49,999 mailboxes$1.25/yr
  • Enterprise: 50,000–99,999 mailboxesAnnual rate; tiered pricing · 50,000–99,999 mailboxes$1.09/yr
  • Enterprise: 100,000+ mailboxes100,000+ mailboxesOn request

As stalwart.email lists them, checked 21 Sept 2026.

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