On 03/02/2015 09:41 PM, Joseph Tam wrote:
then setup fail2ban to manage extrafields
Now that's a very interesting idea, thank you! I will investigate this.
If you don't expect yor firewall to handle 45K+ IPs, I'm not how you expect dovecot will handle a comma separated string with 45K+ entries any better.
My firewall can handle that without breaking a sweat. I just haven't found a way (that I'm comfortable with) to automatically inject rules into it from a machine on the network.
Doing it via a DNSBL is an elegant solution to the problem, IMO.
I'm agnostic as far as which method you want to use. All I'm saying is that using dovecot's allow_net facility is as difficult, if not more so, than letting your firewall handle it.
I'm not disagreeing with you. As I stated above, getting new rules into my firewall in an automated way is not something I've found a good way to do yet. Granted, it has been a couple of years since I've googled around to see if anyone has been able to do it in a reasonably secure way. (Perhaps it's time for me to revisit that.)
-Dave-- Dave McGuire, AK4HZ/3 New Kensington, PA