MX, SPF, DKIM, DMARC, Blacklist, DNS, PTR, header analysis and SMTP diagnostics — all in one place.
Frequently asked questions
SPF (Sender Policy Framework) tells other mail servers which IP addresses are authorized to send email on behalf of your domain. Without it, your emails are more likely to land in spam.
Your emails may be rejected or marked as spam by other providers. You need to identify the cause (compromised server, mass sending, etc.) and request removal from the relevant list.
They’re not mandatory, but more providers (Gmail, Outlook) increasingly require them or heavily penalize their absence to reduce the risk of your emails landing in spam or being rejected.
MX, SPF, DKIM, DMARC and blacklist checks, PTR records, email header analysis and SMTP diagnostics.
Not for diagnosing — you can check any domain. You’ll need access to your DNS panel if you want to fix the records the tool flags.