> The MX RR will be ignored. There will be an AAAA DNS request and a > fallback to the A RR for security.eu.debian.org. Newer versions of > sendmail and Postfix will treat that MX RR as a bad MX and reject the > message instead of retrying.
Exim also treats the record as a "no SMTP service here" indication. I would even go so far to call this a de-facto standard (which just hasn't been documented by the IETF). (BTW, your user agent mangled Ondřej's name.) _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
