A more simple approach would be to put a delay around each mail sent by a non-athenticated agent. For most people sending a couple of mails at a time, a 1 sec delay would not change their experience. For spammers trying to send hundred thousands... it would take too long. Easy, cheap and simple.
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A more simple approach would be to put a delay around each mail sent by a non-athenticated agent. For most people sending a couple of mails at a time, a 1 sec delay would not change their experience. For spammers trying to send hundred thousands... it would take too long. Easy, cheap and simple.