mailerr
Cold email infrastructure, handled.
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.
Key features
warmup, spam tests, and sender reputation
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.
Agentic stack profile
APINot publicNo public programmatic access.
No public API. Not usable from an agent without scraping.
Agentic readinessNoneNot usable from an agent without scraping.
No public API. UI-only. Not usable from an agent without scraping, which we don't recommend.
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.
mailerr alternatives
Tools that solve a similar problem — compared at a glance.
- Pricing
- Seat-based
- Budget
- $
- Best for
- SDR / BDR, Founder
- Readiness
- None
- API
- No
- 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 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.