Hello, My boss let me set a ESP system for my company, i need some help. The ESP system include five parts: Frontend: Interspire Backend: PowerMTA DNS: Powerdns Web: dedicated server Bounce: ? I have already completed the four parts. Now I don't know how to choose bounce service? In the beginning, i planed to install postfix + dovecot + postfixadmin + squirrelmail on Ec2, BUT Try many times according to these tutorials on, always can't succeed. I have to say I am a newbie on linux server. I would like to get some help for experienced email marketers, give me some advice, or if have any system could replace the postfix + dovecot + postfixadmin + squirrelmail, pls make sure easy to do that. Thank you!