[Dovecot] Configuration advices for a 50000 mailboxes server(s)

[Stan Hoeppner]

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