Is there a way to prevent my client to send spam?

[m0rpheu5]

Hello guys, i would like to know if there is a way to prevent my clients to send spam, like only can send 500 emails per day, don´t accept to send more than 20 emails on CC or BCC, can i do that with magic spam or do i need a third software like Policyd?

[magicspam]

MagicSpam provides a set of blocklists and a set of rules that can be used to prevent a great deal of spam. However, it does not do recipient-limiting.

Something you may want to consider is to require SMTP authentication and enforce secure password policies. That should prevent unauthorized users from sending, provides an easy way to account for who sent what, and the secure password policies help prevent compromised accounts that can be used to send out spam.