For sales teams running cold outbound, Maildoso provides cold-email inbox and domain infrastructure built for deliverability, used by 6,000+ companies to keep sequences out of spam.
Presence & Market Position
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GTM Developer Tools
▼ 6 60-day move
Measures earned, engagement-weighted share of voice across the GTM voices panel. Methodology →
Maildoso is positioning itself as the deliverability infrastructure behind high-volume cold email, with inboxes and domains managed as part of the outbound system rather than as a setup detail. Practitioner workflows place it alongside sequencers and enrichment tools, with particular attention to inbox rotation, sending volume, and the relationship between copy, domain health, and reply rates. The company’s Warmup and Deliverability Insights feature extends that position with health signals for sending setups. Its presence is practical and operational, centered on keeping outbound programs usable as volume scales.
Zapmail
Loops
Infraforge
Postmark
Twilio SendGridTikTok, ZoomInfo, Deel, Apollo, Cognism, Capchase, Woodpecker
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Business Profile
Maildoso launched in 2023 as email infrastructure for the cold-outbound market, and has scaled since to more than 400,000 managed mailboxes and 10 million-plus emails sent daily across roughly 7,000 customers, primarily agencies and outbound teams. The company runs independently, with a compact team of under 30, and has not disclosed outside funding. Its emphasis stays on volume and price, mailbox plans starting under a dollar a month, positioning itself as the low-cost layer under sequencers like Instantly and Smartlead rather than a sequencer itself.
Agent Readiness
Measures how easily your agents can build on it — API, MCP, CLI, SDK, docs depth. Methodology →
Maildoso's agent-facing surface is its API, used today for programmatic mailbox and domain provisioning, volume management, and inbox rotation. Outbound practitioners describe wiring that API into custom agents that monitor mailbox health, flag blacklists, and manage rotation without a dashboard — machine-driven account management built directly on top of the existing infrastructure API.
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