On 08/06/2022 21.25, Brandon Long via mailop wrote:

so the false positive rate for the new rule is better.  It doesn't
even need to be a new rule, maybe your reputation just decreased
slightly and it now is below the threshold.

I know of a couple of similar cases -- to me it seems Google's Bayesian
heuristic (if there is such a thing) was over-zealous or something.
It did not seem to matter if the outgoing messages passed SPF tests and/or
had a correct DKIM signature: dsn=5.0.0, stat=Service unavailable.

However, I haven't seen those today.

Brandon, can you please look if your reject rates were suddenly up for
a while, I'm sure there are statistics available?

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