Hi, > Now that you done some optimization, kick default_process_limit back > down to 200 and see it that works. If so, keep backing it off by 25 > each time until you start to see the slowdown again. Then bump it back > up by 10 and leave it. > > Next I'd look at smtp-amavis and see if it's keeping up with demand. If > it can't service requests fast enough postfix will spawn more smtpds to > handle the incoming connections and then they'll sit and wait on amavis. > Optimizing a complex setup as yours is a balancing act because you have > so many layers depending on each other. > >> Thanks so much for your help, > > Sure thing. If you know what your peak daily connection rate is, and > can share that, it would be helpful.
I'm still adjusting it a little bit at a time, and will follow up next week with that info. 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. Thanks again for your help, Alex
