On 4/21/2012 4:52 AM, Jan-Frode Myklebust wrote:
On Thu, Apr 19, 2012 at 07:31:13PM -0500, Stan Hoeppner wrote:
This issue has come up twice on the Postfix list in less than a month.
Oh, thanks! I'll look into those list posts.. I had mostly given up solving this by rate limits and decided to throw hardware at the problem when I saw the log entries for sender *.anpdm.com.. Seems to be a newsletter sender, which I found as 203 different mailserver ip-addresses in our incoming mailserver logs, from 53 different B-nets and 8 different A-nets.
Yeah, they're a newsletter service provider.
Will give smtpd_client_connection_count_limit a try..
Setting this to 1 or 2 should severely slow their delivery rate. You can also do rate limiting at a much more fine grained level with a Postfix policy daemon such as postfwd (Postfix firewall daemon), though the setup is a bit more complicated.
-- Stan