Send your issue to a test address and see where it landed at twelve mailbox providers, inbox or spam. The same report runs 42 technical checks on the copy that arrived: SPF, DKIM and DMARC alignment, blocklists, two spam engines, the Gmail and Yahoo bulk sender rules, and the content itself. Every problem comes with a plain-language fix. Free, no signup, with an API and an MCP server if you want to test from a script or an AI agent.
Mailwarm is an email warm up tool that improves sender reputation and email deliverability, ensuring your campaigns reach inboxes, get more responses, and convert better. Mailwarm supports email warm up for Gmail, Outlook, Yahoo, Zoho, and major email service providers, including SendGrid and other SMTP-based platforms.
Price Comparison
Feature Comparison
Email Spam Tester and Mailwarm both have great feature sets so the right tool for you really depends on your needs.
| Features | Email Spam Tester | Mailwarm |
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