Weitse, For some reason, random mails from you pop up in my inbox, instead of my postfix list instead delivery on behalf of postfix-users@postfix.org like most others. Just an FYI
> If the NAT assumes that everything is a web client and drops > connections after a few seconds, then Postfix will report lost > connections. > > If the NAT keeps connections open but it is a crappy box that can > maintain state for only 100 connections, then it will be forced to > to drop connections, and Postfix will report lost connections. I was thinking that at first. The firewall has a high connection timeout and we tweaked up the connection tracking buckets pretty high, but still under the 4g of ram it has. The case that was pointed out failed after receiving a few mb in the first transmission and only a couple hundred k in the retries. I'm sure it's not a probable with postfix, I'm just looking for postfix cases where they have overcome this type of config issue. Gary-