Question 1

Do I need all three records?

Accepted Answer

Most organizations should publish SPF and DMARC, and use DKIM for signing via their email provider.

Question 2

What is a DKIM selector?

Accepted Answer

A label used to find the DKIM public key in DNS (selector._domainkey.example.com).

Question 3

Why does SPF fail?

Accepted Answer

Often due to missing includes, too many DNS lookups, or multiple SPF records.

Question 4

Should DMARC be set to reject?

Accepted Answer

Start with monitoring (p=none), then enforce once you confirm legitimate senders pass SPF/DKIM.

Question 5

Will this fix spam placement?

Accepted Answer

It helps, but reputation, content, and list hygiene also matter.

SPF DKIM DMARC Checker – Validate Email Authentication DNS Records