What is a DMARC record, and what are its key components?

A DMARC record is a TXT record in your DNS that tells receiving mail servers how to handle emails that fail SPF and DKIM checks. It consists of three main parts: `p` (policy), `rua` (reporting URI), and `ruf` (reporting format). The `p` policy dictates the action to take (reject, quarantine, or accept), `rua` specifies a URL where reports are sent, and `ruf` defines the format of those reports (JSON, XML, or text).