On 04.03.2014 23:38, Homer Wilson Smith wrote: > Rate limiting is interesting but doesn't really stop the spam.
Use postfwd or similar to rate-limit to say 100 mails/recipients per 6 hours. If the limit is triggered look at the logs and if it looks like spammers disable the account and tell the user how to get it back. If you have lots of those cases educate your users about spyware or password sharing.
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