Hi, In our setup we have mail firewall which receives all the emails from Internet. We have 4 MX's and we have pointed all the MX IP's on firewall with equal preference.
We then NAT packets from mail firewall to Ironport which handles Spam Filtering and delivers mails to mail cluster for delivery. On Ironport all mails from mx1 goes to Ironport1, mx2 to Ironport 2 and so on until MX4. The problem we are facing here is that all mails come to Ironport1 as mx1 is pointed to this IP and MX is cached by global MTA's. We receive 75 mails in 10 seconds on our first Ironport whereas all other Ironports are idle. So we decided to route mails based on mail size before mails go to Ironport. Does anyone have idea of how to do mail routing based on mail size using postfix. *Regards,* *Niket Joshi* <mtha...@arionsys.net> **
