• Test an SMTP serverConnect to any mail server, see its TLS certificate and features, check a username and password, and send a test email, with every step explained.
• Check which SMTP ports are openTest all four mail ports of a server at once and see which answer, which are blocked, and what the server says when it picks up.
• MX lookupSee which mail servers receive email for a domain, in priority order, with their IP addresses and a quick health check.
• SPF and DMARC checkerCheck whether your domain's SPF and DMARC records are set up correctly, in plain language, so your email reaches the inbox and nobody can pretend to be you.
• DKIM checkerFind a domain's DKIM public key under the selectors common providers use, or the one you enter, and check its type, length and settings.
• Email blacklist checkCheck an IP address, or a domain with its mail servers and website, against Spamhaus, SpamCop, Barracuda and 13 other spam blocklists at once.
• Email warmup plannerPlan how fast to raise your sending volume on a new domain or mailbox, day by day, so Gmail and Outlook learn to trust you instead of sending you to spam.