On 24.05.24 20:41, Northwind via Postfix-users wrote:
my guess, submission clients were using ehlo, and a mx client uses helo command. so postfix differ them based on this command?
EHLO is the extended HELO, supports SMTP extensions. Mail clients just like servers may use either, but nowadays I would expect all of them to use EHLO, especially because of DSN and SIZE extensions.
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