Questions
What is SPF?
SPF is a DNS record listing the servers allowed to send email for your domain. Receivers check it, and mail from servers not on the list is marked as suspicious or rejected.
What is DMARC?
DMARC tells receivers what to do when a message fails SPF and DKIM checks: deliver it anyway (p=none), send it to spam (p=quarantine) or refuse it (p=reject). It can also send you reports about who is sending as your domain.
Do I need DMARC?
Yes, if you send email from your domain. Since 2024 Gmail and Yahoo require SPF, DKIM and DMARC from bulk senders, and a DMARC record helps every sender's mail reach the inbox.
Does this check DKIM?
DKIM has its own tool: the DKIM checker finds your key under common selectors, or under the selector you enter, and checks its strength.
More email tools
- 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.
- 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.