[exim] if smtp delivery was blocked switch IP

Hello



We meet, in the last weeks, any issue with mailing list delivery for IP
block for the x hours sent message.



We respect all rules and policy, with double opt-in way



Exim is configured on LAMP/Cpanel server



We need a rules/transport or configuration where
-> if smtp get error as, but not only, "550 SC-001 Unfortunately, messages
from ** weren't sent.."

-> switch the IP from, as a backup IP ..



And any other rules that can be better ways


Thanks for help



WS