Checks the TTL (Time to Live) for the MX record.

MX records only need to be changed when the website changes how it receives email. This should be infrequent and planned ahead of time. Therefore, a short TTL for an MX record is unnecessary and can cause extra DNS traffic. We recommend a TTL of 1 day, but this test will only produce a warning if the TTL is shorter than 1 hour or longer than 1 week.

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