Gmail and Yahoo require DMARC. Make sure you're compliant. Learn More.

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DMARC Record Generator

Create a valid DMARC record in a few clicks to use it in your DNS.
Relaxed (r) or Strict (s) SPF identifier alignment
Relaxed (r) or Strict (s) DKIM identifier alignment
This will be the host portion of the domain or just the name of the domain and .com, .net, .org, etc.