Hello
I have a vps with 10 public ip’s + 1 domain name.
What i am trying to do is to create 10 subdomain name and to assign to every subdomain a dedicated ip.
Specially for smtp. for example:
1.1.1.1 - a.example.com
2.2.2.2 - b.example.com
3.3.3.3 - c.example.com
And when a mail user
test@a.example.com send a email the outgoing smtp ip to be 1.1.1.1 , and i s a user test@b.example.com send a mail , the outgoing smtp ip to be 2.2.2.2 etc.
Any help for this?
Howdy,
It sounds like you may be after sender dependent outgoing email. That process is described here:
Hello
I can not find " Send outgoing email for domain from IP" on Server Configuration -> Email Setting
Howdy,
What Virtualmin version are you using there?
And what distro/version are you using?
-Eric
Get it, i am reinstalling from zero, thank you for your reply 
It is ok 1.770?
is postfix is yet on mail_version = 2.6.6 version
Howdy,
Unfortunately, your Postfix version doesn’t support that feature.
It requires Postfix 2.7 or higher.
Is it an option to use a Linux distribution that comes with a more recent Postfix version?
-Eric
I am usign centos 6.7, do you have any suggestion? Or how to upgrade postfix?
Howdy,
The version of Postfix that comes with CentOS 6 unfortunately does not support the feature you are after.
There isn’t a supported way to upgrade Postfix – the only way to do that would be to use a Postfix version from a third party repository, and doing that is likely to cause problems.
So our recommendation is migrate to another distribution/version that includes the Postfix version you need.
-Eric
Solved with ubuntu 14.04.
thank you for your support