Alright!!! I have an unmanaged vps from a reputable company(don't want to mention their name here it is irrelevant). I am selling shared hosting to my clients. In cPanel I have restricted the hourly emails sent to a maximum 100. Do you think I am doing enough to prevent email spam from this vps? Or I should do more? Do server owners put some sort of firewall to restrict the email spam capabilities of end users? Or I will have to take care of everything? I have never gotten any complaints or anything but I just want to be on a safe side.
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