DNS check

Check the records a sending domain needs before you add it. No account, and nothing you type is stored.

The check reads four names and nothing else: the domain, _dmarc, as1._domainkey, and send. It returns the SPF, DMARC and return-path records to publish, and whether a DKIM key is already at that name. The DKIM value is created when you add the domain, so this page does not invent one.

10 checks a minute from one network. A private name, an address, or a mailbox provider's domain is refused.

Where each record goes is in the domains guide. The bounce decoder reads a diagnostic, and the budget calculator turns a monthly volume into a key ceiling.