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Mailreef

Cold email infrastructure at scale

Deliverability
For AI agents
APILimited readiness
About

What is Mailreef

Mailreef handles the infrastructure layer of cold email outreach — provisioning dedicated mail servers, dedicated IP addresses, and 150+ mailboxes per server, with SPF, DKIM, and DMARC records configured automatically on domain registration. It's built for agencies, SDR/BDR teams, and founders who need to run outreach at volume without hitting the daily sending caps that come with Google Workspace or Outlook. The standout capability is programmatic mailbox and domain creation via API or Zapier, which lets teams spin up entire outreach environments in minutes rather than days. It connects natively with Smartlead and Instantly, so the infrastructure slots into existing sequencing workflows without rebuilding anything. That said, Mailreef is infrastructure only — it doesn't write sequences, manage contacts, or provide analytics beyond server and mailbox monitoring, so you'll need a separate sending tool to run the actual campaigns.

Deliverability
Capabilities

Key features

Deliverability infrastructure

warmup, spam tests, and sender reputation

No-code automation support

works with major iPaaS platforms

Our verdict

Vanderbuild take

Mailreef sits squarely in the deliverability infrastructure layer — it's the plumbing that agencies, founders, and BDR teams reach for when Google Workspace sending limits become the bottleneck, not the sequencer. On the agentic readiness front, the API exists and Zapier is supported, but the agentic readiness is rated Limited — you can automate domain and mailbox provisioning programmatically, but don't expect to build a sophisticated AI-orchestrated outbound stack on top of it without hitting gaps in the API surface. At $240/month plus $0.001 per send, it's affordable for small teams running moderate volume, though costs can climb once you're pushing serious send counts across multiple servers. The honest constraint here is scope: Mailreef does infrastructure and nothing else — no sequence builder, no contact management, no reply handling — so budget for at least one additional tool to run the actual outreach.

Mateusz Sekta
Founder, vanderbuild
Learn more

Our Resources

The wedge

Agentic stack profile

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
Limited

Usable but with caveats — rate limits, brittle endpoints.

API exists but is rate-limited, brittle, undocumented, or hidden behind enterprise plans. Use with caution in production agent workflows.

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

Mailreef alternatives

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

Mailreef(this tool)
Pricing
Workspace-based
Budget
$$
Best for
SDR / BDR, Agency
Readiness
Limited
API
REST
winnr
Pricing
Seat-based
Budget
$$
Best for
GTM Engineer, Founder
Readiness
Native
MCP
Yes
API
REST
Infraforge
Pricing
Usage-based
Budget
$
Best for
SDR / BDR, Agency
Readiness
Limited
API
REST
Answers

Frequently asked questions

Does Mailreef have a public API?

Yes — Mailreef ships a REST API. Docs: https://mailreef.com/email-api. Note the API is rate-limited or enterprise-gated, so plan integrations accordingly.

How much does Mailreef cost?

Mailreef: pricing is workspace-based, expect mid tier ($$) spend. Full pricing page: https://www.mailreef.com/pricing.

Who is Mailreef best for?

Mailreef is built for SDR / BDR, Agency, Founder. Fits SMB (1-50), Mid-market (50-500)-sized teams.

How well does Mailreef fit an agentic sales stack?

Tier: Limited. An API exists but it's rate-limited, brittle, or enterprise-gated. Plan integrations carefully.