In .wellknown/mta-sts.txt file set max_age >= 86400 so it is consistent with the google guidance.
Google’s (Create an MTA-STS policy - Google Workspace Admin Help) states that the max_age value must be between 86400 (1 day) and 31557600 (about 1 year).
In my testing over the past few weeks, Google reported “no policy found” when the max_age is lower than that range.
