search for: smtp_

My need: Considering a Sendmail relay running on the firewall (IP: 200.1.1.1), I need all TCP/SMTP outgoing connections to the Internet appers to be from another ISP allocated external IP (200.1.1.2), not the main FW''s IP. As stated in Docs (http://shorewall.net/shorewall_quickstart_guide.htm#id2485947), I read Setup Guide to try to solve my problem but I cannot figure out how to change

...d, '@', domain) AS user, password \ FROM users WHERE userid = '%n' AND domain = '%d' user_query = SELECT uid, gid, home FROM users WHERE userid = '%n' AND domain = '%d' This is the pertinent part of the postconf -fn output: broken_sasl_auth_clients = yes smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/usr/local/etc/postfix/sasl_password_maps smtp_sasl_security_options = noanonymous smtp_sasl_type = dovecot smtpd_client_restrictions = reject_unauth_pipelining permit_sasl_authenticated smtpd_relay_restrictions = permit_mynetworks permit_sasl_au...

I've googled around and although I get a lot of hits about postfix smarthost authentication with ssl, I can not find out how to actually accomplish the task. I've read through smatterings of postings from Neophasis and the like searching for just the syntax and what file (I assume it's main.cf) I should be using; however, any smtpd_ lines I have tried result in postfix hanging and