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Mailforge

Cold email infrastructure at scale

Deliverability
For AI agents
No MCPAPICapable readiness
About

What is Mailforge

Mailforge handles the infrastructure layer of cold outreach — provisioning domains and mailboxes in bulk, configuring DNS records automatically, and hosting inboxes so teams can send at scale without manual setup. It's built for founders and GTM engineers at early-stage and growth-stage companies who need to spin up multi-domain sending fast without hiring a sysadmin. The standout capability is SSL domain masking for branded domains, which lets you send from custom-looking addresses without exposing your primary domain to deliverability risk. Mailforge also connects into a broader Forge Stack alongside Warmforge for warm-up and Salesforge for sending, giving you a single coordinated outbound pipeline. That said, if you're not already in the Forge ecosystem, the integrations outside of Salesforge and Slack are thin — teams running other sending tools may find the native connectivity limited.

Deliverability
Capabilities

Key features

Deliverability infrastructure

warmup, spam tests, and sender reputation

Native team chat integration

first-party connectors, no middleware required

Also ships

official SDK

Outbound webhooks

event-driven integrations

Our verdict

Vanderbuild take

For founders and GTM engineers who need to run cold outreach across dozens of domains without touching DNS manually, Mailforge is a straightforward infrastructure tool that does exactly what it says. The API is available, so you can wrap Mailforge into your own orchestration layer or MCP setup when you're ready to go agentic — it won't fight you, but you're building that layer yourself since there's no native MCP server. At $3 per mailbox per month, the cost to test is low enough that there's no real reason not to try it before committing. The honest limitation is ecosystem lock-in: Mailforge works best when you're also using Salesforge and Warmforge, and teams outside that stack will find the native integration surface narrow.

Mateusz Sekta
Founder, vanderbuild
Learn more

Our Resources

The wedge

Agentic stack profile

MCP server
No

No MCP. Use the REST API or SDK to integrate with agents.

If you want to use this in an agentic workflow, wrap the REST API in a custom MCP server.

API
REST

Programmatic access available.

REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.

API docs →
Agentic readiness
Capable

Solid API access — wraps cleanly for agent use.

Solid REST or SDK access. No MCP server yet, but easy to wrap in custom agent tooling. Most modern SaaS tools land here.

Stack role
Deliverability

Where 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.

Compare

Mailforge alternatives

Tools that solve a similar problem — compared at a glance.

Mailforge(this tool)
Pricing
Usage-based
Budget
$
Best for
Founder, GTM Engineer
Readiness
Capable
MCP
No
API
REST
Warmupinbox
Pricing
Custom
Budget
$$$$
Best for
SDR / BDR, RevOps
Readiness
Capable
API
REST
Zapmail
Pricing
Client-based
Budget
$$
Best for
SDR / BDR, Agency
Readiness
Capable
API
REST
Answers

Frequently asked questions

Does Mailforge have an MCP server?

No — Mailforge doesn't expose an MCP endpoint. You can wrap its REST API in your own agent tooling instead.

Does Mailforge have a public API?

Yes — Mailforge ships a REST API. Docs: https://www.mailforge.ai/blog/agentmail-api.

How much does Mailforge cost?

Mailforge: pricing is usage-based, expect entry tier ($) spend. Full pricing page: https://www.mailforge.ai/pricing.

Who is Mailforge best for?

Mailforge is built for Founder, GTM Engineer. Fits Solo, SMB (1-50)-sized teams.

How well does Mailforge fit an agentic sales stack?

Tier: Capable. Solid public API, no MCP yet — straightforward to wrap in your own agent tooling.