Most SMTP testers only check if your server connects. Then you need separate tools for SPF, DKIM, DMARC, blacklist checks, and spam scoring. This does all of it in one test. - SMTP connection on any port (25, 587, 465, 2525) - SPF, DKIM, DMARC record verification - MX and PTR record checks - IP blacklist scan (major RBLs) - Spam score analysis - Your password is used once and never stored Free. No account. No download. nesdzo.com/smtp-tester