How to change the email FROM to user's domain, not mine?

CentOS
#1

Anybody knows how to set up DNS, postfix(centOS) or necessary others to make my email server send out email with custom domain in Email FROM field?

For example:

My mail server domain: @helloworld.com
Now the user will get my emails with From: [email protected]

But I want to have:
Users would get my email with FROM: [email protected]

Thanks a lot.

Best regards,

BoolCoding

#2

And we call this feature like “Custom Domain”. As I known, MailChimp is using this technology running their marking mail campaign, but I think it should be the core value of MailChimp, and I just want to know can we implement the same solution? Thanks.