Good Afternoon, I'm hoping to get a sense of the group here please as regards current best practices regarding the TTLs of SPF and other email-related DNS records.
More specifically, whether short TTLs (like 300) have been documented to be related to SPF lookup fails, deliverability or other issues. 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.) Links to specific resources would be most welcomed. Thank you, Mark -- _________________________________________________________________ L. Mark Stone, Founder - Mission Critical Email LLC North America's Leading Zimbra VAR/BSP/Training Partner For Companies With Mission-Critical Email Needs Winner of the Zimbra Americas VAR Partner of the Year - Two Years Running! _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
