And this is why...
And this is why blacklisting IP addresses is a bad idea. When you have up to a thousand or more domains sharing a single mail server, hence a single IP address (or even a small range of IP addresses), it's ridiculous to think that it's acceptable to block that IP address based on spam originating from it (especially if it's only a couple of messages). Blacklisting IP addresses only works properly when only one domain is using that address. I understand the desire to reduce the load on your server coming from spambots, but blacklisting IP addresses is not a reasonable way to do so. The potential for far-reaching collateral damage is just too great.
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