Email deliverability toolkit for humans and AI agents
Your emails go to spam. mailX shows you why, and how to fix it in seconds with clear answers and exact steps. Built for humans and AI agents. API and MCP ready.
Like most founders, email has been our #1 sales channel since our first startup in Paris. That’s what led us to build @Mailwarm and work on email deliverability since 2020. And one thing became clear: your emails don’t land in the inbox by magic.
Over the years with mailwarm (YC S20, #1 Product of the Day for March 4th, 2020 🏆), we’ve helped thousands of teams improve deliverability. And we kept seeing the same thing:
People either don’t know what’s wrong…
Or they see the data, but don’t know how to fix it.
So they guess.
That’s why we built mailX.
Run a check -> understand what’s broken -> fix it with clear steps. No signup. No guesswork.
We also made it usable by AI agents, not just humans.
If email is part of your growth, tell me in comment how you’re using it. We’ll take a look and help you improve it.
About mailX by mailwarm on Product Hunt
“Email deliverability toolkit for humans and AI agents”
mailX by mailwarm launched on Product Hunt on May 20th, 2026 and earned 504 upvotes and 262 comments, earning #2 Product of the Day. Your emails go to spam. mailX shows you why, and how to fix it in seconds with clear answers and exact steps. Built for humans and AI agents. API and MCP ready.
On the analytics side, mailX by mailwarm competes within Email, Email Marketing and Artificial Intelligence — topics that collectively have 539.2k followers on Product Hunt. The dashboard above tracks how mailX by mailwarm performed against the three products that launched closest to it on the same day.
Who hunted mailX by mailwarm?
mailX by mailwarm was hunted by Garry Tan. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Garry Tan
Like most founders, email has been our #1 sales channel since our first startup in Paris. That’s what led us to build @Mailwarm and work on email deliverability since 2020.
And one thing became clear: your emails don’t land in the inbox by magic.
Over the years with mailwarm (YC S20, #1 Product of the Day for March 4th, 2020 🏆), we’ve helped thousands of teams improve deliverability. And we kept seeing the same thing:
People either don’t know what’s wrong…
Or they see the data, but don’t know how to fix it.
So they guess.
That’s why we built mailX.
Run a check -> understand what’s broken -> fix it with clear steps.
No signup. No guesswork.
We also made it usable by AI agents, not just humans.
If email is part of your growth, tell me in comment how you’re using it. We’ll take a look and help you improve it.