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mailerr

Cold email infrastructure, handled.

Deliverability
For AI agents
None readiness
About

What is mailerr

Mailerr handles the infrastructure layer of cold email: it automates domain registration, DNS configuration (SPF, DKIM, DMARC, MX), and mailbox provisioning so teams can spin up sending accounts without touching a DNS panel. It's built for SDRs, founders, and agencies running outbound at volume — particularly those managing multiple domains or client workspaces simultaneously. The standout capability is multi-workspace management, which lets agencies configure and monitor separate sending environments for different clients from one place. Sender profiles can be customized per account, and domains can be purchased directly inside the platform. Where it stops being a fit: Mailerr is infrastructure only — it doesn't write, sequence, or send your emails, so you'll still need a separate outreach tool to actually run campaigns.

Deliverability
Capabilities

Key features

Deliverability infrastructure

warmup, spam tests, and sender reputation

Our verdict

Vanderbuild take

Mailerr is a focused infrastructure tool for SDRs, founders, and agencies who want to stop losing time to DNS configuration and start sending — we think it earns its place in any outbound stack where domain and mailbox setup is a recurring bottleneck. On the agentic side, there's no API and no MCP server, so you can't drive this from an agent or orchestration layer without scraping the UI — it's fully manual-access only, which is a real ceiling if you're building automated provisioning workflows. At $40/month to start, the risk to test is low, and the seat-based tiers scale reasonably for small teams. The honest limitation is scope: Mailerr stops at infrastructure, so you're still stitching it to a sequencer, and teams expecting a single-pane-of-glass outbound platform will need to look elsewhere.

Mateusz Sekta
Founder, vanderbuild
Learn more

Our Resources

The wedge

Agentic stack profile

API
Not public

No public programmatic access.

No public API. Not usable from an agent without scraping.

Agentic readiness
None

Not usable from an agent without scraping.

No public API. UI-only. Not usable from an agent without scraping, which we don't recommend.

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

mailerr alternatives

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

mailerr(this tool)
Pricing
Seat-based
Budget
$
Best for
SDR / BDR, Founder
Readiness
None
API
No
Mailforge
Pricing
Usage-based
Budget
$
Best for
Founder, GTM Engineer
Readiness
Capable
MCP
No
API
REST
Infraforge
Pricing
Usage-based
Budget
$
Best for
SDR / BDR, Agency
Readiness
Limited
API
REST
Answers

Frequently asked questions

Does mailerr have a public API?

No — there's no publicly documented API as of today. mailerr is operated through its UI.

How much does mailerr cost?

mailerr: pricing is seat-based, expect entry tier ($) spend. Full pricing page: https://www.mailerr.co/pricing/.

Who is mailerr best for?

mailerr is built for SDR / BDR, Founder, Agency. Fits Solo, SMB (1-50)-sized teams.