Free tools
Check your domain email setup — no signup.
DMARC checker
SPF, DKIM, DMARC, MX and MTA-STS in a second.
SPF record checker
Enter a domain — we show the SPF record, count DNS lookups across all includes and tell you what to fix.
DKIM checker
Enter a domain and selector — we find the DKIM key, estimate its length and flag problems.
Blacklist checker
Enter a domain or IP. For a domain we check its addresses, its mail servers (MX) and the domain itself in URI blocklists.