MX records, short for Mail Exchange records, are a type of resource record in the DNS that specifies a mail server responsible for accepting email messages on behalf of a recipient's domain. However, MX records do not handle encryption of email messages. Email encryption is managed by other protocols and technologies, such as TLS or PGP. MX records are only responsible for directing email to the correct server.
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What are MX records in DNS?
What protocols or technologies are used for email encryption?