SM

Email Server Software

Stalwart Mail Server

Stalwart Labs · checked 24 Oct 2026

How it plugs in

—Public API
NoOpen source
YesFree tier

Signal on Email Server Software5.0#26 of 33

Stalwart Mail Server home page

Pricing

  • Enterprise$2.40/yr
  • CommunityFree

As stalw.art lists them, checked 24 Oct 2026.