DNS records are entries in a domain’s zone: A and AAAA point to the website’s IP address, CNAME creates an alias, MX names the mail server, and TXT holds service data such as SPF or domain verification.
A mistake in a single record can take a website or email offline, so keep a copy of the zone before making changes.
The most common changes are the A record when moving a website, MX when connecting email, and TXT for verifying the domain with services and setting up SPF, DKIM and DMARC.
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