It appears that Slavko via mailop <li...@slavino.sk> said: >>>+ both are able to use underscored labels (eg. _dmarc), in contrast >>> of idna library, which rejects that domain name with invalid char > >>That is correct. IDNA is only for encoding hostnames, and hostnames do not >>allow >>underscores. > >Neverending discussion about what is hostname and what is domain >name?
No, that difference has been clear for about the past 40 years. A domain name is a sequence of labels, with each label being a string of 65 octets or less. Hostnames are a subset of domain names, where each label consists only of letters, digits, and hyphens. In IDNA, A-labels are all LDH so a sequence of A-labels is a hostname. The IDNA2003 and 2008 rules tell you what U-labels correspond to A-labels and so what are internationalized hostnames. Like I said, internationalized text is hard, and trying to take shortcuts will make you sorry. R's, John _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
