On 02/16/2017 11:07 AM, David Jones 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?

To block outbound bursts using SA is probably the most inneficient method.

Fai2ban is probably safer / easier to manage
Also, look into inbound rating per sender / IP & time period.

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