Well, in my case this is recipient verification - I am sending abuse complaints in bulk and to eliminate tons of email bounces I have enabled address verification.
On 8/15/23 15:43, Viktor Dukhovni via Postfix-users wrote:
So it seems that legitimate domains (from which one actually cares to receive mail) with persistently broken STARTTTLS rarely send mail to Postfix sites with sender verification enabled.
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