Hello, All. I did some testing of the IP address number-of-connections limit function, and found a behavior that you should be aware of if you use this function. The mailer I used to send the test messages makes a new connection for each email address in the "from" field. If the number of recipients in the from field exceeds the max SMTP ip connections limit, the IP address will be blocked and get a PB score (if enabled). Blocking starts as soon as the limit is exceeded, so some mail will not be delivered. I reduced the frequency test duration due to this issue so the function still helps prevent denial-of-service, but mail isn't blocked for the default 3600 seconds.
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