Free tools

These helpers run in the browser or via public DNS. They do not call the paid verification API and they do not send mail.

• SPF generator — Build a v=spf1 record. You still publish it at your DNS host.
• DMARC generator — Policy, RUA, and alignment tags as a copy-paste TXT record.
• DKIM template — Selector host plus a public-key placeholder. Keys are not generated here.
• BIMI record — v=BIMI1 with an HTTPS SVG logo URL.
• Email syntax check — Format only. This is not a mailbox or catch-all verdict.
• Header reader — Paste a received message and inspect Authentication-Results locally.
• MX lookup — Public DNS MX lookup for a domain. No verification credits.