Email Deliverability Checker

Check SPF, DKIM, and DMARC readiness for inbox placement. Enter values for instant results with step-by-step formulas.

December 2025

Formula

Security Score = SPF(30) + DKIM(30) + DMARC(40)

We weight the three pillars of email authentication. DMARC 'Reject' policy carries the most weight as it is the only mechanism that actively blocks fraudulent emails. SPF and DKIM are prerequisites for DMARC.

Worked Examples

Example 1: Full Protection

Problem:SPF: -all, DKIM: Yes, DMARC: Reject

Solution:Score 100/100. Domain is fully secured against spoofing.

Result:100/100 (Secure)

Example 2: Monitoring Only

Problem:SPF: ~all, DKIM: Yes, DMARC: None

Solution:Score 60/100. Good for visibility, but attackers can still spoof you.

Result:60/100 (Monitoring)

Example 3: Vulnerable

Problem:SPF: None, DKIM: No, DMARC: None

Solution:Score 0/100. Emails likely to land in spam; domain reputation at risk.

Result:0/100 (Vulnerable)