On Mon, 16 May 2016 12:25:10 +0100 Dominic Benson <domi...@lenny.cus.org> wrote:
>> Accepting that not all ISPs are as helpful as they might be, I can't > easily think of a legitimate reason for needing the TTL on the PTR of > a mail server to be small, so if a blacklist operator finds it an > effective way to manage request volume then that doesn't seem > unreasonable. > Aren't short TTL's also indicative of load balancing and "cloud" systems? If this is truly the case it would seem a legitimate practice which makes blacklisting short TTL seems quite unreasonable. ISTR that this is an ancient topic and there should be plenty of archived discussion. (No, I won't research it for you. Sorry.)
