Allow case of MX record fallback to A record #101
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In section 5.1 of https://tools.ietf.org/html/rfc5321 "If an empty list of MXs is returned, the address is treated as if it was associated with an implicit MX RR"
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In section 5.1 of https://tools.ietf.org/html/rfc5321
So in other words, checking only MX record is not enough.