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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.
First seenMay 20, 2026
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
STATUS:verified
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.
Why it was included
Product Hunt launch with 504 upvotes, 262 comments, and a clear product website describing a functional toolkit with no signup required.