MailX Email Deliverability
Audit custom-domain email authentication and blacklist status from your coding agent before you send launch or lifecycle email.
Overview
MailX Email Deliverability is a MCP server for the Launch phase that audits SPF, DKIM, DMARC, and BIMI, checks blacklists and mail connectivity, and helps generate email DNS records so product email reaches the inbox.
What is this MCP server?
- Check SPF, DKIM, DMARC, and BIMI alignment for a sending domain
- Scan domain and IP reputation against common email blacklists
- Exercise SMTP and IMAP connectivity against configured mail hosts
- Run DNS lookups for mail-related records from the agent
- Generate recommended email DNS records to paste into your registrar
- Protocol: Model Context Protocol server schema 2025-12-11
- Transport: streamable-http remote at https://themailx.com/mcp
- Published server version: 1.0.0
What problem does it solve?
You are ready to email users from your domain but cannot tell whether authentication, blacklists, or mail-server settings will bury messages in spam.
Who is it for?
Indie founders configuring billing, auth, and notification email on a domain they control and want MCP-driven checks inside their editor.
Skip if: Teams on a managed ESP that owns deliverability end-to-end and never touch raw DNS or SMTP diagnostics.
What do I get? / Deliverables
You get agent-readable deliverability findings and DNS record guidance you can apply at your registrar before sending at scale.
- SPF, DKIM, DMARC, and BIMI validation summary for the queried domain
- Blacklist and mail-path connectivity signals you can act on
- Generated email DNS record snippets ready to publish
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Journey fit
Deliverability work usually surfaces when a solo builder is about to send real product email—welcome flows, waitlists, and notifications—where inbox placement is a launch distribution risk. Distribution is the canonical shelf because SPF, DKIM, DMARC, and BIMI directly determine whether outbound email reaches users instead of spam folders.
How it compares
Streamable-http MCP integration for email DNS and reputation checks, not a marketing automation skill or ESP dashboard.
Common Questions / FAQ
Who is MailX Email Deliverability for?
It is for solo builders and small teams shipping SaaS or API products who send email from their own domain and need SPF, DKIM, DMARC, and blacklist validation from their AI coding agent.
When should I use MailX Email Deliverability?
Use it before launch sends, after DNS changes, or when users report missing email—whenever you need to confirm authentication records, blacklist status, or SMTP/IMAP reachability.
How do I add MailX Email Deliverability to my agent?
Register the remote MCP server at https://themailx.com/mcp (streamable-http) in your Claude Code, Cursor, Codex, or compatible MCP client, then invoke deliverability and DNS tools against your domain.