[SERVICE] [INFRASTRUCTURE] Achieving 99% Inbox Rate: DKIM, SPF & DMARC Setup

[JackaL]

[INFRASTRUCTURE] Achieving 99% Inbox Rate: DKIM, SPF & DMARC Setup

If your B2B cold emails are landing in spam, your DNS infrastructure is likely incomplete. Google and Yahoo enacted strict sender requirements in 2026. You must configure these three TXT records.

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• SPF (Sender Policy Framework): Tells receiving servers which IP addresses are authorized to send emails on your behalf.
  v=spf1 include:_spf.google.com ~all
• DKIM (DomainKeys Identified Mail): Adds a cryptographic signature to your emails to ensure they were not tampered with in transit.
• DMARC (Domain-based Message Authentication): Tells the receiving server what to do if SPF or DKIM fails. Start with a monitoring policy:
  v=DMARC1; p=none; rua=mailto:admin@yourdomain.com;