On 10/15/2021 6:44 PM, Grant Taylor via mailop wrote:
I can see a hypothetical scenario where a client is running a firewall that is filtering connections based on IP reputation. So if an SMTP server is erroneously listed, said firewall might block the IP, thereby blocking the client's access to the IMAP server if it was on the same IP as the SMTP server.
while reputation is a component of the example, I think the actual argument is more generic: If something bad happens to one service, having the other on a separate IP address will tend to isolate it from that bad effects.
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