Mailin
Cold email infrastructure, ready in minutes.
What is Mailin
Mailin provisions cold email infrastructure end-to-end: it creates domains and mailboxes, configures DNS authentication records (SPF, DKIM, DMARC), and routes sends through dedicated servers and IPs — all within about 10 minutes of onboarding. It's built for SDR and BDR teams, agencies running multi-client outreach, and founders who need sending volume without sharing IP reputation with strangers. The standout capability is private email infrastructure — your sending environment is isolated, not pooled, which directly reduces deliverability bleed from other senders. Mailin does not include a sequencing or campaign execution layer, so you'll need a separate outreach tool to actually send and track replies.
Key features
warmup, spam tests, and sender reputation
first-party connectors, no middleware required
Vanderbuild take
Mailin is a pure infrastructure play in the deliverability category — if your SDR team, agency, or founder-led outbound is bleeding into spam folders because you're on shared IP pools, this is the category of fix you need. The REST API is available and capable enough that you can wrap Mailin into your own automation layer or MCP orchestration stack without much friction — provisioning new client domains programmatically is a real use case here. At budget tier 3, starting at $299/month for 200 mailboxes, you're paying for an experienced operator to get value out of it — vanilla setup without a deliberate domain warming and rotation strategy will leave the deliverability guarantee untested. The honest gap is that Mailin stops at infrastructure: there's no sequencing, no reply tracking, and no campaign analytics, so you're committing to a two-tool stack minimum before you send a single email.
Agentic stack profile
APIRESTProgrammatic access available.
REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.
API docs →Agentic readinessCapableSolid 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 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.
Mailin alternatives
Tools that solve a similar problem — compared at a glance.
- Pricing
- Workspace-based
- Budget
- $$$
- Best for
- SDR / BDR, Agency
- Readiness
- Capable
- API
- REST
- Pricing
- Usage-based
- Budget
- $
- Best for
- Founder, GTM Engineer
- Readiness
- Capable
- MCP
- No
- API
- REST
- Pricing
- Custom
- Budget
- $$$$
- Best for
- SDR / BDR, RevOps
- Readiness
- Capable
- API
- REST
Frequently asked questions
Does Mailin have a public API?
Yes — Mailin ships a REST API. Docs: https://app.mailin.ai/api-documentation.
How much does Mailin cost?
Mailin: pricing is workspace-based, expect higher tier ($$$) spend. Full pricing page: https://mailin.ai/.
Who is Mailin best for?
Mailin is built for SDR / BDR, Agency, Founder. Fits Mid-market (50-500), Enterprise-sized teams.
How well does Mailin fit an agentic sales stack?
Tier: Capable. Solid public API, no MCP yet — straightforward to wrap in your own agent tooling.