SPF
Also called Sender Policy Framework.
SPF is a line in your domain's settings that lists which servers may send email for you.
It is a TXT record in your domain's DNS. When an email arrives, the inbox checks whether the sending server is on your list. A domain should have only one SPF record, so add each new email tool to the same line.
Gmail asks every sender to set up SPF or DKIM, and bulk senders to set up both, plus DMARC. Set SPF up on day one, and include every tool that sends for you. It protects your email deliverability. Only then warm up a new domainsoon.
Go deeper
- How to warm up an email domain for cold emailComing soon
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Sources
- Email sender guidelines, Gmail Help, checked 24 September 2026
Last checked 24 September 2026.