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Free Email Tools
A free toolkit to diagnose and fix the records that decide whether your email reaches the inbox. Check everything at once, or dive into a single record.
Email authentication
Email Authentication Checker
Enter a domain to validate its SPF, DKIM, DMARC, and BIMI records in a single pass. We run live DNS lookups, flag the issues that send your mail to spam or let attackers spoof you, and tell you exactly how to fix each one.
SPF Record Checker
Check whether your domain’s SPF record is valid: we parse it, follow every include recursively, count DNS lookups against the RFC 7208 limit, and flag risky qualifiers like +all.
DKIM Record Checker
Look up your DKIM public key by selector and validate it: we check the key’s presence and format, estimate its strength, and detect CNAME delegation to your email provider.
DMARC Record Checker
Validate your domain’s DMARC record: we check the policy strength, alignment settings, and reporting addresses, and flag weak or missing configuration that leaves you open to spoofing.
BIMI Record Checker
Validate your BIMI setup: we check the record, fetch and validate the SVG logo, detect your VMC, and confirm the DMARC enforcement that BIMI requires to display your logo.
Deliverability & diagnostics
MTA-STS & TLS-RPT Checker
Enter a domain to validate its MTA-STS policy and TLS-RPT record. We read the _mta-sts TXT record, fetch and parse the published policy, report the enforcement mode and MX coverage, and check that TLS-RPT names a valid reporting address.
Reverse DNS (PTR) Checker
Enter a sending IP address to look up its PTR (reverse DNS) record and confirm forward-confirmed reverse DNS. Mailbox providers reject or spam-folder mail from IPs that have no PTR or one that does not match — this is one of the first things receivers check.
Blacklist (DNSBL) Checker
Enter a sending IP address or a domain to check it against major public DNS blocklists. A listing can mean instant rejection or spam-foldering at many providers, so it is worth checking before and during any sending program.
Email Header Analyzer
Paste the raw headers from a message you received and we parse the Authentication-Results, Received-SPF, DKIM-Signature, and ARC headers to show whether SPF, DKIM, and DMARC passed for that specific message — the verdict the receiving server actually reached.
