The Internet host name.
A list of the MX records found is placed into the array mxhosts.
If the weight array is given, it will be filled with the weight information gathered.
TRUE if any records are found; returns
FALSE if no records
were found or if an error occurred.
This function should not be used for the purposes of address
verification. Only the mailexchangers found in DNS are returned,
however, according to » RFC 2821
when no mail exchangers are listed, hostname
itself should be used as the only mail exchanger with a priority of