What is SubsiMail?

SubsiMail is a self-hosted cold-email outreach tool: multi-step campaigns, contact lists, open/click tracking, and reply detection, running on a server you control instead of a SaaS platform reading your outbound mail.

What it is

You install one binary (or run one Docker container), point it at your own domain, and connect the email inboxes you already own. From there it behaves like any cold-email SaaS tool — import contacts, build a sequence, send — except the campaigns, contacts, and sending accounts all live in your own SQLite database, not a vendor's.

Bring your own cloud (BYOC)

SubsiMail doesn't run its own shared sending infrastructure. Instead, when you connect Gmail or Outlook, you register a small OAuth app under your own Google Cloud or Azure account first, then connect through it. This is what makes self-hosting possible without SubsiMail needing to pass Google/Microsoft's app-review process on your behalf — you're using your own quota, your own app identity, your own trust relationship with the provider.

Is this for you?

SubsiMail is a good fit if you:

• Send cold outreach from real inboxes you already control (Gmail, Outlook, or any SMTP/IMAP account)
• Don't want a third party able to read your contact lists or outbound email content
• Are comfortable running a small server, or already have one
• Want flat per-inbox pricing instead of per-seat SaaS pricing

It's not a managed/hosted product — there's no "sign up and go" cloud version. You run the server.

Next steps

Pick your install method and get the server running, then finish the first-run setup wizard:

• Install with Docker (recommended)
• Install the Linux binary
• Install the Windows .exe