[pfx] Re: stop bulk messages

[Ken Peng via Postfix-users]

May 6, 2023 at 8:14 PM, "Ralph Seichter via Postfix-users" 
 wrote:


> 
> * Corey Hickman via Postfix-users:
> 
> > 
> > Some clients abuse the outgoing smtp server for sending bulk messages.
> >  [...] Do you know how to stop this behavior?
> > 
> 
> There is 'default_destination_recipient_limit' to limit the number of
> recipients per message delivery. If however the abuser uses only a few
> recipients for each message, perhaps even generating one message per
> recipient, more processing is required. A custom milter can count and
> limit the number of messages sent by authenticated users in a given time
> interval.

https://github.com/nitmir/policyd-rate-limit
This one is using by me. It does work fine.


--
 https://kenpeng.pages.dev/
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[pfx] Re: stop bulk messages

[Ralph Seichter via Postfix-users]

* Corey Hickman via Postfix-users:

> Some clients abuse the outgoing smtp server for sending bulk messages.
> [...]  Do you know how to stop this behavior?

There is 'default_destination_recipient_limit' to limit the number of
recipients per message delivery. If however the abuser uses only a few
recipients for each message, perhaps even generating one message per
recipient, more processing is required. A custom milter can count and
limit the number of messages sent by authenticated users in a given time
interval.

-Ralph
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[pfx] Re: stop bulk messages

[Wietse Venema via Postfix-users]

Corey Hickman via Postfix-users:
> 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?

Perhaps you can use postfwd (www.postfwd.org) to limit the number
of messages that a customer can send in some time interval.

Wietse
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[pfx] Re: stop bulk messages

[Byung-Hee HWANG via Postfix-users]

Corey Hickman via Postfix-users  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 <<>>.

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

Also Amazon SES is proper relay service for bulk messages.

Sincerely,

-- 
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