Defer instead of reject when RBL match
Open Discussion
I'd like to have the option to return a temporary SMTP error (SMTP code 4XX) instead of a permanent one (SMTP 5XX) when remote host is in a RBL.
This allows good remote hosts affected by a RBL listing to clean any bad emails in their mail queues and send deferred emails later without getting lots of bounces.
in exim this would mean to change "reject" by "defer" in the generated ACLs related to RBL
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