In article <4878884.yiV4iTtLKX@kitterma-e6430> you write: >> In authentication service identifiers in EAI-formatted messages, a U-label >> and its equivalent A-label are considered to be the same. > >As an implementer (who's tried really hard to avoid spending cycles on EAI - >sorry), does this translate into "be prepared for UTF-8 in any A-R element >that may contain an email address or a domain"?
That's partly it. IDN domain labels can be in two different forms, a UTF-8 U-label or an xn--punycode A-label. It would be a good idea to treat them as equivalent. There are translation libraries, and it's easy to recognize U-labels by checking for the 0x80 bit so this is not a lot of code. Having been writing MTA patches to handle EAI better last week, I say this from experience. R's, John _______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
