Maildoso
Cold email infrastructure, handled.
What is Maildoso
Maildoso handles the infrastructure layer of cold email outreach — provisioning domains and mailboxes, auto-configuring SPF, DKIM, and DMARC, rotating IPs across campaigns, and running inbox placement tests every three days to surface per-mailbox health scores. It's built for lead gen agencies, GTM engineers, and founders at SMBs and mid-market companies who need to run outbound at volume without managing DNS and deliverability manually. The standout capability is automatic mailbox recovery: burned mailboxes are disconnected from campaigns for 14 days and then cycled back in, reducing the manual overhead of maintaining sender reputation at scale. Where it falls short is depth of analytics — if you need granular campaign reporting or CRM-native attribution, you'll need to layer another tool on top.
Key features
warmup, spam tests, and sender reputation
Vanderbuild take
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.
Agentic stack profile
MCP serverYesLive MCP server — agents can call this tool directly.
Exposes tools for Model Context Protocol (MCP) allowing AI agents to programmatically manage email infrastructure, including domain registration, account provisioning, and deliverability optimization.
Open MCP →APIRESTProgrammatic access available.
REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.
API docs →Agentic readinessNativeBuilt for agents from the ground up.
MCP server + agent-friendly API + at least one autonomous workflow out of the box. The bar for 'Native' is high — only a handful of tools currently qualify.
Stack roleDeliverabilityWhere this tool slots into an agentic pipeline.
Plays the role of Deliverability in an agentic pipeline. Use it to keep email sending reputation healthy — warmup, spam tests.
Maildoso alternatives
Tools that solve a similar problem — compared at a glance.
- Pricing
- Seat-based
- Budget
- $$
- Best for
- GTM Engineer, Agency
- Readiness
- Native
- MCP
- Yes
- API
- REST
- Pricing
- Seat-based
- Budget
- $$
- Best for
- GTM Engineer, Founder
- Readiness
- Native
- MCP
- Yes
- API
- REST
- Pricing
- Seat-based
- Budget
- $
- Best for
- SDR / BDR, Founder
- Readiness
- Native
- MCP
- Yes
- API
- REST
Frequently asked questions
Does Maildoso have an MCP server?
Yes — Maildoso exposes a Model Context Protocol server. Exposes tools for Model Context Protocol (MCP) allowing AI agents to programmatically manage email infrastructure, including domain registration, account provisioning, and deliverability optimization. See the MCP docs at https://mcp.maildoso.com/mcp.
Does Maildoso have a public API?
Yes — Maildoso ships a REST API. Docs: https://api.maildoso.com/docs-scalar.
How much does Maildoso cost?
Maildoso: pricing is seat-based, expect mid tier ($$) spend. Full pricing page: http://getmaildoso.com/.
Who is Maildoso best for?
Maildoso is built for GTM Engineer, Agency, Founder. Fits SMB (1-50), Mid-market (50-500)-sized teams.
How well does Maildoso fit an agentic sales stack?
Tier: Native. Has both an MCP server and an agent-friendly API — drops into an agentic stack with minimal glue code.