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A Mail Exchange record, or MX record, is an entry in a domain-name database that identifies the mail server responsible for handling email for that domain. In other words, your MX record is like your primary postal address, to which all of your mail is sent. When you use Spamclam, you change your MX record to make the address of Spamclam your primary address so all email from the outside is sent to Spamclam first. This conceals your Internet-facing mail servers and gateways and protects you from attack. Spamclam then filters your email as it is redirected to your true address.
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