Postfix send email from dedicated ip address

Hello friends

I made a procedure to exchange the ip of the sending emaol server to another ip

I used easier mode below that is in this cwp manual
http://wiki.centos-webpanel.com/postfix-send-email-from-dedicated-ip-address

:
to set server-wide for all clients
You want smtp_bind_address = 66.66.66.67 and inet_interfaces = all
or inet_interfaces = eth (whatever) that 66.66.66.67 is enabled.
and RESTART postfix

example: inet_interfaces = XXX.xxx.XXX.XXX
or exemple : inet_interfaces = eth0:5

everything ok to receive, but when I send it by webmail - SMTP Error (-1): Connection to server failed.

is there anything else i need to do?