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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