Hi, thanks to all answers. So it is not allowed to use underscores in DKIM selectors but even large companies are using such selectors. So what's the usual case than? Try to convince the sender of their problem or ignore the error at all? I guess a typically "it depends" case. 😉
Thanks again for the input from all. Regards Norbert -----Ursprüngliche Nachricht----- Von: John Levine <jo...@taugh.com> Gesendet: Mittwoch, 6. November 2024 23:01 An: mailop@mailop.org Cc: Fehlauer, Norbert <n.fehla...@systema-online.de> Betreff: Re: [mailop] Underscore in DKIM Selectorname? It appears that Fehlauer, Norbert via mailop <n.fehla...@systema-online.de> said: >-=-=-=-=-=- >-=-=-=-=-=- > >Hi, > >I know that an underscore in DKIM selectornames usually trigger a DKIM neutral >error. I guess >somewhere in the RFC it is stated if an underscore is allowed or accepted. Can >someone please >point out the correct RFC to me? RFC 6376 section 3.1 says that a selector is a sequence of dot separated sub-domain items, which is imported from RFC 5321 which says sub-domain is a sequence of letters, digits, and hyphens, i.e., a host name. The underscore in the selector is just wrong. I don't know what Cloudflare is thinking. R's, John
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