Maildoso

Maildoso is the infrastructure layer that cold email operations actually run on — not a sequencer, not a CRM, just the plumbing that keeps domains warm and IPs clean, and it does that job without requiring a dedicated ops person to babysit it. If you're serious about agentic outbound, this is non-negotiable: the MCP server makes it especially useful as an orchestration layer for AI agents that need to spin up mailboxes, check health scores, or rotate IPs programmatically without human intervention. At $1.80 per mailbox, it's affordable for small teams, though costs will stack as you scale the number of domains and mailboxes across multiple clients or campaigns. The honest limitation is that Maildoso stops at the infrastructure boundary — there's no built-in sequencing, copy tooling, or reporting, so you're assembling a stack around it rather than running everything from one place.