Spam Hunting

So I have this client who, according to the whm mail log, has sent over 5,000 messages in the past week. How do I go about finding out if this guy is spammer?

There's this other client I have who appears to have several aliases, and in the log, these aliases appear with :blackhole: near them (I can't recall the exact syntax). What is the significance of this?

Thanks

Ian

 

 

 

 

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