On 26 Feb 2020, at 13:53, Lyle Giese via mailop wrote:
Don't know if ATT looks at this but I know they used to. The TTL for the A record for server.divebums.com is 900 seconds. If checking this parameter, it was recommended that this be at least 12 hrs or 43,200 seconds. The theory was that 900 seconds indicated it was on a dynamic ip address.
I've seen that criteria used in the past in a DNS blacklist. TBH, I haven't seen this mentioned anywhere else in relation to deciding whether an IP address is static or not. In particular, there are many reasons you might want to have a short TTL – geo load balancing is just one of them.
I would tend to think that an organization doing that is trying very hard to be "static", as in "being there to receive your email" :-)
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