Alex wrote:
Hello everyone!
Do we have some 5xx error code, which drop connection immediately as it fo
421?
No. and it's even worst: even if you implement code that does so, the
client will probably ignore the 5xx error and consider the disconnect as
a temp failure. so all you get is 421 behaviour.
From docs:
"Use "421" reply codes for botnet-related RBLs or for selected non-RBL
restrictions. This causes Postfix 2.3 and later to disconnect immediately
without waiting for the remote SMTP client to send a QUIT command."
Thank you.
Alex.
