Of course I disabled the mailaccounts of the spamming students. But I want to take measures to prevent abuse in the future, with Squirrelmail or otherwise. Our provider disables our account when we sent hundreds of mails per second. Postfix 2 has a built-in feature to limit the sending rate...
At my school, students love it to hold the enterkey in squirrelmail to send hundreds of mails in a few seconds.
I tried to slow down Postfix 2.2.5 with
anvil directives like:
$smtpd_client_message_rate_limit =1
but it has no effect.
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