Warmbly

Warmbly is for founders, sales teams, agencies, recruiters, and fundraisers who need to manage cold email outreach across multiple mailboxes. Connect Google Workspace, Microsoft 365, or another account through SMTP and IMAP, then create email sequences, add contacts, set sending hours, and distribute campaigns across your mailboxes with per-mailbox sending limits and spacing. Warmbly can also warm up connected mailboxes and check sending-domain records such as SPF and DMARC. Replies from all connected mailboxes appear in one inbox, where they can be labeled by response type. Campaign and mailbox analytics track sends, replies, and bounces; a built-in CRM provides contacts, pipelines, deals, tasks, and meetings. Warmbly is open source and can be used in the cloud or self-hosted, making it an option for teams that want to run their own outreach platform.

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