Summary
Email servers usually occur at least twice between the sender and the intended recipient of emails - including spam emails. This creates at least two opportunities for spam to be stopped dead in its tracks, and save bandwidth resources and costs in the process.
Firstly, the email server accessed by the sender should capable of recognising OUTGOING spam, and stop it at source. Outbound filters and rate limiters are an important, though currently under-utilised part of that process.
Secondly, the email server from which an end-user receives his/her email should also be fully featured, to filter out spam and other security risks before they reach the recipient.
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