Free email and invoice tools
Check SPF, DKIM, DMARC, MTA-STS and TLS-RPT records. Parse DMARC reports, decode headers, validate XRechnung XML, and convert provider snippets.
Email authentication check
MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT
Run a combined Postscale Check for the records receivers inspect before trusting mail from a domain, including SMTP TLS policy and aggregate TLS reporting.
SPF record checker
Parse and validate SPF
Walk a domain's SPF include/redirect tree, count DNS lookups against the 10-lookup budget, and spot records that will permerror at receivers.
DKIM record lookup
Inspect DKIM public keys
Enter a domain and selector to see the published TXT record, parsed key type, approximate key size, and warnings on revoked or weak keys.
DMARC check
Score DMARC enforcement maturity
Fetch a domain's DMARC record, see the parsed policy, get a 0–5 maturity score, and receive concrete next-step recommendations.
DMARC aggregate parser
Parse RUA XML reports
Paste or upload a DMARC aggregate (RUA) XML report to see per-source records, DKIM/SPF alignment, and the aggregate pass rate. No uploads.
XRechnung validator
Validate EN 16931 XML
Paste or choose an XRechnung UBL/CII XML invoice and run Postscale's EN 16931/XRechnung preflight checks before sending or ingesting it.
Email headers analyzer
Decode raw email headers
Paste raw email headers to see the routing hop chain with timing, authentication results (SPF/DKIM/DMARC/ARC), and every parsed field.
Email API migration converter
Convert provider snippets
Translate common SendGrid, Mailgun, Postmark, Resend, and SES send calls, webhook adapters, SMTP settings, and suppression CSV exports into Postscale-ready snippets.
Why we built these
Every time we help a new customer onboard, we run the same sequence of checks: parse their SPF, confirm their DKIM key isn't expired, make sure their DMARC is recording reports to a mailbox we can read. We used to run these from the terminal; now they live as free diagnostics so you can too. No account required.
If you end up needing this functionality in production — parsing DMARC reports nightly, monitoring DKIM rotations, alerting when a new sending source appears — that's what our product APIs are for.
Automate this?
When the one-off tools stop scaling, Postscale's APIs pick up — DMARC reporting, inbound email, transactional sending, masked addresses, XRechnung e-invoicing.
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