On 2016-10-02 12:59, Reindl Harald wrote: > >> IOW, can a given *IP* appear in more than one A record? I realize >> that this does have the problem that the reverses would resolve to >> hostX not >> test > > on IP should only have on PTR - period > > avoid anything else than PTR/A-matching if the machine is supposed to > send outbound mail
it is very helpful to have multiple PTR records for an IP on a mail server so anti-spam engines can accurately make fully verified forward and reverse lookups not just for DNS but also certificate verification. mail servers that can't correctly emit the right EHLO for outbound email should remain in the 1990s. _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
