On 15 Dec 2020, at 6:14, Jaroslaw Rafa via mailop wrote:
But I assume the mailserver didn't get a *positive* reply "yes, it is
confirmed that the user DOESN'T exist" but simply wasn't able to
connect to
the database and verify whether the user exists or not.
That assumption is called into serious doubt by the fact that GMail is
replying with a very specific extended response code which states the
exact opposite of the assumption.
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