Email

Build a BIMI DNS TXT record for your selector and provider while checking DMARC posture, logo evidence and publication readiness.

Check a domain's BIMI readiness across DMARC, logo SVG and certificate evidence with live public DNS results plus prioritized fix notes.

Check a mail host or sender IP across selected DNSBLs, distinguish policy listings from resolver errors, and inspect provider evidence.

Check bulk sender readiness for Gmail, Yahoo and Outlook using delivered headers plus DNS, complaint-rate and unsubscribe evidence before launch.

Validate DANE TLSA records across mail or direct TLS routes with DNSSEC evidence, record checks, and optional certificate digest comparison.

Build a DKIM TXT record from a selector and public key with validation and DNS string splitting, plus rollout checks before publishing.

Check a DKIM selector in public DNS and review its record count, key strength and policy tags with clear testing and resolver evidence.

Build a current or legacy DMARC TXT record with policy inheritance and reporting destinations plus DNS string splitting and rollout review.

Validate a domain's DMARC policy and check syntax, alignment and external report receivers before making stricter mail enforcement changes.

Audit a domain's public DNS for authority, address and mail-policy gaps while comparing TTL horizons and resolver-visible evidence across common records.

Inspect raw email headers locally to trace relay delays and compare recorded SPF, DKIM and DMARC evidence while spotting sender mismatches.

Build a professional email signature with clean HTML and plain text, normalized contact links, and practical compatibility checks before pasting.

Check an email domain's MTA-STS TXT and HTTPS policy, then review MX patterns and the policy-host certificate before enforcement.

Inspect a domain's MX route and compare public DNS answers while catching Null MX conflicts, unresolved exchanges, and alias targets.

Practice spotting phishing cues and choosing safer responses in 30 fictional scenarios, with answer explanations and focused retries for missed questions.

Look up SMIMEA or OPENPGPKEY records for a mailbox and derive its RFC owner name with DNSSEC and resolver evidence plus cache and payload details.

Build an SPF TXT record from real sender paths with ordered mechanisms and lookup-budget planning plus DNS packaging and rollout checks.

Check a domain's SPF record, trace include and redirect dependencies, and flag duplicate policies or lookup-budget risks from public DNS.

Validate a TLS-RPT policy from live DNS or pasted text, check report destinations and RFC rules, then build a reviewable TXT record.