On Thu, 16 Feb 2017 10:07:46 +0000 David Jones <djo...@ena.com> wrote:
> Would it make sense for me to setup/manage my own custom > rules for checking the To: header or could the FreeMail plugin > be extended to add new rules like FREEMAIL_TO? The To: header may not contain useful information. I don't think the usual spam-filtering techniques are appropriate for blocking internal abusers; I think you want to apply some sort of rate-limiting that blocks senders (possibly domains and IP addresses) that exceed some number of recipients per hour. It's not trivial to set this up, unfortunately. Regards, Dianne.
