What SPF is meant to do
SPF is an allowlist policy published in DNS. It gives receiving systems a way to check whether your sending infrastructure is authorized to send mail on behalf of your domain.
That helps reduce spoofing risk, but SPF alone is not enough for strong sender trust.
Common SPF problems
The most common problems are missing records, multiple SPF TXT entries, or outdated policies that no longer reflect the providers actually sending mail for the domain.
MailsSetu documentation treats SPF as part of a full sender-authentication posture rather than a single checkbox.
Frequently asked questions
What is SPF in email?
SPF is a DNS-based policy that lists which mail systems are allowed to send for a domain.
Can I publish multiple SPF records?
No. You should maintain one valid SPF record for each domain.
Does SPF affect deliverability?
Yes. Missing or broken SPF weakens sender trust and can hurt acceptance.
Implementation references
Once the category fit is clear, most teams move through the same path: quickstart, domain authentication, implementation docs, and then deliverability monitoring.
Create a sandbox send flow and validate your first request path.
Set up DKIM, SPF, and DMARC for production sending.
Review endpoints, payload shapes, and response semantics.
Learn how authentication and suppression behavior affect inbox placement.