On Wed, 13 May 2009 21:53:25 +0200 Magnus Bäck <mag...@dsek.lth.se> wrote:
> > IIRC there's a limit for limiting outgoing smtp connections. I just > > can't find it. Anyone a hint? > > Limiting in what sense? The total number of concurrent SMTP clients, > concurrency per destination, ...? No, just limit the number of outgoing connections. In iptables language: iptables -I OUTPUT 1 -o eth0 -p tcp --syn --dport 25 -m connlimit --connlimit-above 1 -j REJECT What happens is: people are sometimes sending 3000 mails with a size of 10MB over a 1Mbit line. This results in 50 simultanous connections at 20kbit/sec. A lot of target servers find it lasts too long and drop the connection. And the mails will stay in the queue forever. If I limit this to two connections, it will last 2 days, but mail will be delivered at the end. If some "normal" mail doesn't get delivered in time, I can tell that mister X has filled up the queue. And yes, I know, I have told them 300 times to use a special client which delivers the mail to the ISP's smtp server. But my LART is broken. -- ___________________________________________________________________ It is better to remain silent and be thought a fool, than to speak aloud and remove all doubt. +------------------------------------------------------------------+ | Richard Lucassen, Utrecht | | Public key and email address: | | http://www.lucassen.org/mail-pubkey.html | +------------------------------------------------------------------+
