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Open-source, self-hostable platform for cold email campaigns and mailbox warmup
Warmbly is an open-source cold email and mailbox warmup tool that you can self-host, keeping your sending IPs, database, and servers under your own control. It connects to your mailboxes so you can build multi-step sequenced campaigns with per-mailbox daily sending caps and spacing, and it brings every connected mailbox and reply together into one unified inbox.
Beyond sending, Warmbly tracks replies and monitors sender reputation and mailbox health, which is the core function of a warmup tool: keeping mailboxes healthy so cold email actually lands in the inbox. Because it is self-hosted, teams running outbound campaigns keep full ownership of their sending infrastructure rather than routing mail through a third-party service.
Warmbly is an open-source cold email and mailbox warmup platform that you can self-host on your own servers, database, and sending IPs.
It lets you connect mailboxes, write multi-step sequenced campaigns with per-mailbox daily caps and spacing, and manage every connected mailbox and reply in one unified inbox. It also sends mail, tracks replies, and monitors sender reputation and mailbox health.
Yes, Warmbly is built to be self-hosted, running on your own sending IPs, database, and servers.
Yes, Warmbly is an open-source cold email and mailbox warmup platform.
