Jonathan S?lea:
> Good evening,
>
> I am in the process of setting up a smtp-relay for a hosting provider.
>
> Basically, the relay should relay emails from hundreds of servers out to
> the net. I do want some "protection" against if a website is hacked and
> starts to spew out thousands of emails.
> For example:
> www.siteA.xyz on ServerY is hacked and someone is using mail() in order
> to send hundreds of thousands email via localhost - that is relayed to
> the smtp relay (that only accepts mail from internal servers). And
> instead of relaying them out to the web it does stop thoose kind of email.
>
> Is that possible? Can postfix just dump the emails "down the drain"
> instead of sending them? And can that be triggered if ServerY sends 100
> emails in 10 seconds for example.
You can use postfwd (www.postfwd.org) to enforce rate limits
on many SMTP properties (client, sender, recipient, ...).
> I hope my problem is easy to understand :)
Quite clear. Thanks for being a good network citizen.
Wietse
