I have a mail server on the inside of my network, I have established all of the ACL's and NAT Statements on the ASA and traffic is flowing correctly inbound. However when the mail server sends traffic outbound ( to external networks) it uses the ASA Primary IP on the outside interface. I would like to force the outbound traffic to external networks to use a particular IP Address (the one that is NAT'ed) for SMTP. As the NAT Statements are already in place and functioning is this a matter of using an extended ACL? If so how should it be constructed? Thank you in advance for the assistance.