Hi PH 👋 I got tired of using 4 different tools every time I needed to debug email deliverability. One for SMTP connection, another for SPF, another for blacklist check, another for spam score. So I built one that does everything in a single test. Enter your SMTP details, hit run, and get the full picture: connection status, DNS records, blacklist status, and spam score — all in one report. Your password is only used to authenticate the test connection. It is never stored, logged, or kept anywhere. The test sends one email to your recipient address and that's it. Built as a WordPress plugin (yes, really) with a PHP backend handling the actual SMTP tests and DNS lookups. Frontend is vanilla JS. Free, no limits, no signup. If it saves you from digging through mxtoolbox tabs, it did its job. Try it: nesdzo.com/smtp-tester Question: would you trust a browser-based tool with your SMTP credentials for a one-off test, or is that still a hard no regardless of the "we don't store it" promise?

Free SMTP Tester - Get Your Spam Score

Test SMTP, SPF, DKIM, DMARC & spam score. No signup.

Test SMTP, SPF, DKIM, DMARC & spam score. No signup.