DKIM
A cryptographic signature added to every email. The receiving server checks it with a public key published in your DNS, which proves the email came from your domain and wasn't changed on the way.
How this affects you
Vaartix signs every email you send with your domain. You publish one TXT record, vaartix._domainkey.yourdomain, with the public key Vaartix gives you (domains added before 30 October 2026 use three CNAME records instead). Until the DKIM record is in place, the domain isn't verified and you can't send from it. Gmail shows a passing DKIM signature as "Signed by yourdomain".
Learn more
Vaartix is a transactional email API built in India. SPF, DKIM and a return path on your domain are set up for you, and every feature is free during the private beta.