Corey Hickman via Postfix-users <postfix-users@postfix.org> writes:

> Hello list,
>
> Some clients abuse the outgoing smtp server for sending bulk messages.
> The messages have the same content of business promotion letter.
> Do you know how to stop this behavior?
>

You can not stop it if he/she is paid user.

Instead, you can redirect him/her to another relay server.
Use <<<sender_dependent_relayhost_maps>>>.

There are so many examples on the INTERNET blogs/forums.

Also Amazon SES is proper relay service for bulk messages.

Sincerely,

-- 
^고맙습니다 _布德天下_ 감사합니다_^))//
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