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.
HIN Check
Checks whether an email address or its mail domain is reachable securely via HIN, the platform for confidential email in Swiss healthcare. Only the domain is transmitted.
Exchange Build Numbers
Every build of Exchange Server SE, 2019, 2016 and older with date and KB article. Enter a build number to see whether the server is current. Syncs with Microsoft automatically every day.
CVE Tracker
Latest vulnerabilities for Exchange, Microsoft 365, Active Directory, mail gateways and mail servers, plus every vulnerability CISA lists as actively exploited. Updated daily, with email alerts.
Electricity and energy
More tools are in the works.
