ISEMAIL_VALID, ISEMAIL_TOOLONG, ISEMAIL_NOAT, ISEMAIL_NOLOCALPART, ISEMAIL_NODOMAIN, ISEMAIL_ZEROLENGTHELEMENT, ISEMAIL_BADCOMMENT_START, ISEMAIL_BADCOMMENT_END, ISEMAIL_UNESCAPEDDELIM, ISEMAIL_EMPTYELEMENT, ISEMAIL_UNESCAPEDSPECIAL, ISEMAIL_LOCALTOOLONG, ISEMAIL_IPV4BADPREFIX, ISEMAIL_IPV6BADPREFIXMIXED, ISEMAIL_IPV6BADPREFIX, ISEMAIL_IPV6GROUPCOUNT, ISEMAIL_IPV6DOUBLEDOUBLECOLON, ISEMAIL_IPV6BADCHAR, ISEMAIL_IPV6TOOMANYGROUPS, ISEMAIL_TLD, ISEMAIL_DOMAINEMPTYELEMENT, ISEMAIL_DOMAINELEMENTTOOLONG, ISEMAIL_DOMAINBADCHAR, ISEMAIL_DOMAINTOOLONG, ISEMAIL_TLDNUMERIC, ISEMAIL_DOMAINNOTFOUND/*, ISEMAIL_NOTDEFINED */