I posted data about this a while back on Linkedin (I'll link it
off-list), with graph comparisons post-TTL change in increments. Albeit,
it was specific to DKIM in our case, but the same effect can be felt
with SPF.
- Mark Alley
On 8/20/2025 11:17 AM, L. Mark Stone via mailop wrote:
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
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