Find DKIM records across the selectors your providers commonly use.
DKIM adds a cryptographic signature to your mail. Receivers fetch your public key from a DNS TXT record at selector._domainkey.yourdomain and verify the signature, proving the message was not altered and really came from your domain.
DKIM keys live under a selector chosen by your provider. We check the common ones (google, default, selector1/2, k1, and more). If your provider uses a custom selector, look it up in their DNS setup guide.
DKIM is one of the two ways to pass DMARC alignment, and it survives forwarding better than SPF. Most deliverability problems trace back to missing or broken DKIM.
DeliverSignal runs these checks daily and alerts you when something breaks.
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