In the SPF vs DKIM vs DMARC comparison, SPF lists who may send your email, DKIM signs each message, and DMARC tells receivers what to do when a check fails. You need all three. Together they stop others from faking your domain and help your mail reach the inbox. SPF vs DKIM vs DMARC at a glance Each record answers a different question. The table shows them side by side. After it, we explain each one in plain words. Record Question it answers Where it lives ...