About mailX
mailX helps humans and AI assistants understand why emails go to spam and what to fix.
We built mailX because email deliverability is still too complicated.
Teams rely on email for cold outreach, marketing campaigns, product onboarding, notifications, transactional emails, and customer communication. But when emails stop landing in the inbox, most tools show raw technical data without explaining what matters or what to fix next.
mailX turns deliverability signals into clear diagnostics and specific actions.
What mailX does
mailX provides instant email deliverability diagnostics through:
- web-based tools;
- API access;
- MCP access;
- DNS checks;
- email authentication checks;
- SPF, DKIM, DMARC, MX, BIMI, blacklist, and inbox placement insights;
- clear explanations and actionable fixes.
Our goal is simple:
Help senders diagnose email deliverability problems faster.
Built for humans and AI assistants
Email is no longer managed only by humans.
AI assistants are now helping teams write emails, monitor workflows, debug systems, run technical checks, and automate business processes.
These assistants need access to live deliverability diagnostics too.
That is why mailX is built for both:
- humans who need clear answers;
- AI assistants that need structured, actionable deliverability data.
Part of the Mailwarm ecosystem
mailX is a brand operated by Mailwarm Inc.
Mailwarm is the email deliverability company. We help senders get into the inbox and stay there through products, tools, and services built for both humans and AI assistants.
Mailwarm
Mailwarm is the original email warmup tool.
It helps build sender reputation automatically through real, positive inbox interactions across a large network of mailboxes, with built-in monitoring and deliverability insights.
Mailwarm is designed for teams that want to build reputation before scaling outreach or campaigns.
mailX
mailX is the diagnostic layer of the ecosystem.
It helps you check email deliverability issues across SPF, DKIM, DMARC, MX, BIMI, blacklist status, inbox placement signals, DNS configuration, and more.
mailX is available through web tools, API, and MCP access.
It gives specific fixes and actions, not just scores.
MailAdept
MailAdept is email deliverability on autopilot.
It is a subscription-based, AI-native service where AI assistants and deliverability experts collaborate to audit your setup, fix issues, and monitor inbox placement continuously.
MailAdept is built for teams that need ongoing deliverability execution, not just one-time advice.
The ecosystem in one sentence
Build reputation with Mailwarm, diagnose problems with mailX, fix and maintain with MailAdept.
Why mailX exists
Email is still one of the most important growth channels for startups, sales teams, marketers, SaaS products, agencies, marketplaces, and AI-powered businesses.
But deliverability is not a simple score.
It is a system.
Your domain reputation, DNS setup, email authentication, sending history, infrastructure, content, engagement, bounce rate, spam complaints, and mailbox provider rules all interact.
mailX helps make that system easier to understand.
What makes mailX different
mailX is designed to provide:
- fast diagnostics;
- live technical checks;
- clear explanations;
- specific fixes;
- web, API, and MCP access;
- outputs that are useful for both humans and AI assistants.
Instead of only showing raw records, mailX helps explain what matters and what to do next.
App, MCP, and connector compatibility
mailX can be used through MCP-compatible clients, AI assistants, apps, and connectors.
To learn more, visit:
- MCP endpoint:
/mcp - MCP documentation:
/docs/mcp
These pages explain how the mailX MCP server works, what it can check, and how to connect it to compatible clients.
mailX is not affiliated with, sponsored by, or endorsed by OpenAI, Anthropic, or any other AI platform provider unless expressly stated in writing by that provider.
Who operates mailX
mailX is operated by:
Mailwarm Inc.
251 Little Falls Drive
Wilmington, New Castle County
Delaware 19808
United States
For general inquiries, contact: