mailX

mailX is an email deliverability toolkit that diagnoses why your emails go to spam and provides clear, actionable fixes for both humans and AI agents.

FOR:

Email senders, marketers, salespeople, and anyone using email outreach who wants to improve inbox delivery rates.

CAN DO:

Helps identify and fix email deliverability issues with step-by-step guidance, unlike generic spam testers that only show problems without solutions. It also supports AI agents via API and MCP, making it accessible for automated workflows.

QUICK TAKE:

Worth trying

WHY DIFFERENT:

It is less about writing one email and more about building the whole campaign workflow.

TRY IF:

You run campaigns often and want copy, design, audience logic, and automation in one place.

SKIP IF:

You only write occasional emails and your current email or docs tool is enough.

EVIDENCE: Product Hunt launch with 504 upvotes, 262 comments, and a clear product website describing a functional toolkit with no signup required.