Good day.
If You use an email relay service, how do You protect it: VMs, iptables
connections rate limit, ... ?
Personally, I have a problem with email sending authorization - how I can
separate the users that have not their boxes on our service and therefore I can
ban their trials to pick up a password - I can not reduce it even to the local
net IPs bt iptables - as port 25 is used for not only for sending our own users
but for receiving it for the local users - as I understand.
Thank You for Your time.
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