Return path is not set while using smtp protocol codeigniter

Hello all,


I am usingh codeigniter email library to send emails. it's working fine but when I set my custom return path in this it always take by default return path as from email. I searched every where but didn't get any positive result please help me

I think there is a possibility that this is a mail server setting, which can't be changed by PHP. Someone correct me if I'm wrong.

Website: http://avenir.ro

How do you set the Return-Path?