[ Version ( since = "0.5.0" ) ]
public string mail_class { get; set; }
Classes of mail accepted at this address.
For example: gdata_gd_mail_class_letters or gdata_gd_mail_class_both .
For more information, see the <ulink type="http" url="http://code.google.com/apis/gdata/docs/2.0/elements.html#gdStructuredPostalAddress">GData specification</ulink>.