On 2/28/2012 8:37 PM, Alex wrote: > I had thought it was related, but another issue I'm trying to figure > out is how to prevent a single remote server from sending thousands of > messages at a time, filling the queue, and causing significant > delivery delays for all mail. > > I thought either greylisting or a few iptables rules to throttle the > connection rate, but I haven't been able to figure this out.
Greylisting won't help with connections from a legit mail server. The proper solution is firewall rules to limit connections per client, and/or QOS rules to limit the bandwidth per client. As a last choice, you can use the various postfix client limits provided by anvil(8). http://www.postfix.org/anvil.8.html Warning: anvil is intended to limit abusive clients only. Using anvil limits to slow down legit mail may cause extreme delivery delays. -- Noel Jones
