"L. Mark Stone via mailop" <mailop@mailop.org> writes: [Mark likely got this twice, sent from the wrong From: address like a newbie]
> I'm personally in the "86000 please unless you are about to make a > change." camp, but a customer is insisting that their short (300) TTLs > have no connection to their deliverability issues. (They are not doing > MTA-STS presently, where I know 86400 as a minimum is effectively > required.) My associates (and I) have produced a number of academic papers on the subject that show the benefits of a longer TTL value: https://ant.isi.edu/%7ejohnh/PAPERS/Moura18b.pdf https://ant.isi.edu/~johnh/PAPERS/Moura19b.pdf https://datatracker.ietf.org/doc/rfc9199/ Cheers, -- Wes Hardaker _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
