All questions
Q & A Email Auth · August 5, 2026

Does DKIM prevent spam?

Not directly. DKIM proves the email came from your domain and wasn’t altered — it says nothing about whether the content is spam. However, a valid DKIM signature improves sender reputation scores, which indirectly helps deliverability. DMARC (which depends on DKIM or SPF alignment) can prevent spoofing, which is what keeps spam from appearing to come from your brand.

Read the full guide
What Is DKIM? How DomainKeys Identified Mail Works
DKIM attaches a cryptographic signature to every email you send. Receiving servers verify the signature against a public key in your DNS — proving the message is authentic and untampered. No DKIM means anyone can forge your brand's email.
Related questions
Can I have multiple DKIM keys for the same domain? How do I add a CNAME for Office 365 Autodiscover? How do I find the DKIM selector for Google Workspace? How do I find the DKIM selector for Microsoft 365? How do I know if my DKIM key is rotating?