Author: Jeroen van Aart Date: To: exim-users Subject: Re: [exim] smtp_max
Jean-Paul natola wrote: > smtp_accept_max_per_host
>
> smtp_accept_max
>
> im currently configured like this:
>
> smtp_accept_max = 20
> smtp_accept_max_per_host = 4
> smtp_accept_reserve = 0
Looks like those settings are fair. But it's not really going to solve
your problem. You need to implement some proper spam blocking methods.
There's various ways to do that. Without getting too specific to the
software used:
Use spamhaus' DROP list to block ranges for ALL traffic at the firewall
level. Add IPs to taste, you never want to see traffic from, think
country blocking if that's your cup of tea.
Use your own block list to block connections to port 25. As well as
various DNSBLs.
Use grey listing.
Use invalid HELO blocking.
Use invalid or no rDNS blocking.
That should slow down the hammering considerably. I'd be glad to help
you out more if you need specific information.
