Free tools for your email domain
Check or create individual records – no test email and no sign-up. For a complete check of a real email, use the email test.
SPF record checker
Check a domain's SPF record: valid syntax, number of DNS lookups (10 at most), overly broad networks and all included records as a tree.
Checker OpenDMARC record checker
Look up a domain's DMARC record and get every setting explained in plain language: policy, reports, alignment.
Checker OpenDKIM key checker
Look up a domain's DKIM keys and check the key length – with a selector or an automatic search for common selectors.
Checker OpenBlacklist check for IPs and domains
Check whether an IP address or domain is listed on major blocklists: Spamhaus, Barracuda, SpamCop, SURBL, URIBL and more.
Checker OpenMX, STARTTLS and MTA-STS checker
Check a domain's MX records, the encryption and certificates of its mail servers and its MTA-STS policy.
Checker OpenEmail header analyzer
Analyze the headers of a received email: the route across servers with delays, SPF, DKIM and DMARC results, alignment and spam score.
Analysis OpenSPF record generator
Build an SPF record step by step – for your own servers, Google Workspace, Microsoft 365 and sending services.
Generator OpenDMARC record generator
Create a DMARC record: choose a policy, enter a report address, copy the finished DNS record.
Generator Open