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 2016-10-02 12:59, Reindl Harald wrote:
on IP should only have on PTR - period
avoid anything else than PTR/A-matching if the machine is supposed to
send outbound mail
On 02.10.16 20:42, David Ford wrote:
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.
I found it problematic, not helpful.
It's much safer and easier to have one PTR record with correct fcrdns when
sending mail than having multiple DNS records (even with valid fcrdns).
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Silvester Stallone: Father of the RISC concept.
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