Mailwarm

Active

Prevents your emails from landing in spam.

Y Combinator S20

What it does

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 agents. ✦ Mailwarm.com: The original email warmup tool. Build sender reputation automatically through real, positive inbox interactions across a large network of mailboxes, with built-in monitoring and deliverability insights. ✦ ThemailX.com: Instant deliverability diagnostics for AI agents and humans. Check all protocols SPF, DKIM, DMARC, Inbox placement and more via MCP, API, or web. Get specific fixes and actions, not just scores. ✦ Mailadept.com: Email deliverability on autopilot. A subscription-based, AI-native service where agents and deliverability experts collaborate to audit your setup, fix issues, and monitor inbox placement continuously. Build reputation with Mailwarm, diagnose problems with themailX, fix and maintain with mailadept. Doing email marketing or cold outreach? Book a call through mailadept.com, we'll show you which one fits.

Its site says now · captured 2026-08-23

Email warmup - Avoid SPAM folder - mailwarm

Email warmup tool to avoid the spam folder and improve inbox placement. Since 2020, Mailwarm’s deliverability team builds sender reputation so emails reach the inbox.

Next to it in B2B SaaS · Email deliverability and warmup

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