Add SubsiMail

[subi26]

App

SubsiMail v2.0.0 — self-hosted cold email sequencing platform. Prospect lists, templates, connected inboxes, and campaign data are stored in the user's own SQLite database on their own server, not a third-party SaaS. Positioned as a self-hosted alternative to Instantly / Smartlead / lemlist / Apollo, with flat per-inbox pricing instead of per-seat fees.

• Website: https://subsimail.com
• Docs/support: https://subsimail.com/docs

Image source

• docker.io/subsimail/subsimail, tag 2.0.0, pinned to the multi-arch manifest-list digest.
• Verified linux/amd64 and linux/arm64 both present via docker buildx imagetools inspect subsimail/subsimail:2.0.0.

Notable setup behavior

• The app requires a free license token from subsimail.com before it's usable, even on the free tier (first connected mailbox is free forever, no card required). From the in-browser setup screen, the user either pastes a token or uses a "Connect your account" button that goes through subsimail.com OAuth. Called out at the top of the x-casaos.description so it isn't a surprise mid-install.
• No default username/password — account creation happens in-browser after the license step.
• Single web service, SQLite data persisted under /DATA/AppData/$AppID/data, migrations run automatically and idempotently on startup.
• No host access, no privileged mode, no extra permissions needed.
• repo/website/docs all point at subsimail.com since the application source is closed — there's no separate public source repo to link.

Testing performed

• Built and pushed the multi-arch image myself (amd64 native + arm64 via buildx/QEMU), confirmed both platforms resolve under one digest.
• Ran the arm64 image directly (docker run --platform linux/arm64), confirmed it boots, prints its normal startup banner, and runs its embedded SQLite migrations without error.
• Validated the compose file loads as expected YAML with the exact x-casaos field shapes from the spec doc (locale-keyed title/tagline/description, quoted port_map, long-form ports syntax). Wasn't able to run the repo's own docker compose config -q / build_dist.sh locally (no docker compose plugin in this environment) — happy to fix anything CI flags.
• Have not yet run a full install through a live CasaOS/ZimaOS instance — happy to do that as a follow-up if a maintainer wants it before merge.

Assets for review

Logo: https://subsimail.com/static/apple-touch-icon.png

Screenshot: https://subsimail.com/static/img/marketing/dashboard-hero.png

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud