SPF
A DNS TXT record that lists the servers allowed to send email for a domain. Receiving servers check it against the domain in the hidden return path, not the From address you see.
How this affects you
Because SPF checks the return path, what matters for Vaartix is the SPF record on your return-path subdomain, vxmail.yourdomain: v=spf1 include:amazonses.com ~all. Vaartix gives you that record when you add your domain. Your main domain's SPF record (for Google Workspace, Zoho or Microsoft 365) doesn't change. A name can only have one SPF record, so if a subdomain already has one, it can't be your return path.
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.