Last updated: February 2026
We collect standard server logs, including IP addresses and the domain names you look up. This data is used for rate limiting, abuse prevention, and understanding which email providers are most commonly encountered. Logs are retained for 30 days on a rolling basis and then automatically deleted.
For email messages sent to your MailTender address, we store the sender address, subject line, authentication results (SPF, DKIM, DMARC), and routing metadata (timestamps, message-id, received headers). We never store message bodies, attachments, or any content from inside the message. This metadata is retained for 21 days and then automatically deleted.
We do not use cookies. We do not collect your name or email address. We do not share data with third parties for marketing purposes.
A randomly generated ID may be stored in your browser's local storage solely to enforce per-browser rate limits. It is not linked to any personal identity.
This service runs on Vercel and uses Supabase for database storage and Upstash for rate limiting. DNS lookups are performed via Cloudflare's DNS-over-HTTPS service.
This policy may be updated from time to time. The date at the top of this page reflects when it was last revised.