[ipv6-wg] Real-world IPv6 SMTP experience
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Florian Weimer
fw at deneb.enyo.de
Wed Dec 21 16:08:16 CET 2005
* Gert Doering: > So if I understand this correctly, having a v4-only backup MX should > solve all problems commonly experienced? As far as I know, the primary MX needs an A record (to satisfy Sendmail), and there needs to be a MX which has an A record only (and no AAAA or A6 record; this is done to satisfy Exim installations). My initial question to this list was whether if you can do this with just a single IPv4 address, and still prefer IPv6 over IPv4 (assuming that IPv6-capable hosts prefer IPv6 hosts over IPv4 hosts if they have the same priority).
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