Johan Pappu put forth on 4/23/2011 2:23 AM: > We are using our own platform to send mails which is in php
This doesn't answer my question. I asked for the application profile, not what language it's written in. If you're not familiar with the term 'application profile' I'll ask a different way: What does the application do, specifically, and how does it do it, specifically. There are reasons I ask. If it is a single threaded application you'll likely never get close to pushing 20k emails in 5 min due to various delays in processing and SMTP submission. Does the PHP application execute on the same physical host as Postfix or on a different host? Does the recipient address database reside on the Postfix host or a different host? Are you using LDAP, mysql, or flat file lookups to populate recipient addresses? These things and more more all come into play. We need details in order to properly assist you. -- Stan