Rafael Pfister

Tools

Free tools for mail, messaging and electricity topics. Everything runs directly in your browser: no signup, no server, no detour to third-party websites.

Mail and messaging

Mail DNS Check

Checks a domain's complete mail DNS setup: MX, SPF (including the lookup limit), DKIM selectors, DMARC, MTA-STS, TLS-RPT, DANE/TLSA and DNSSEC.

Email Header Analyzer

Makes an email header readable: Received chain with transit times, SPF, DKIM and DMARC results, alignment, ARC and spam filter fields. Fully local, the header never leaves your browser.

Command Builder

Over 60 ready-to-run commands for everyday admin work: DNS, SMTP, TLS/OpenSSL, LDAP, networking, packet capture, PKI, IMAP, mail queue, time and logs. DNS resolves right in the browser.

Electricity and energy

LEG Price Calculator

Is a Swiss local electricity community worth joining? Weighs the grid-usage discount against the service fee, for consumers and solar producers. Preset with EKZ 2026 tariffs, every value adjustable.

More tools are in the works.