SENDMAIL not receiving bounced emails HELP

Job ID: 37389154

Budget: $30 – $250 USD

I use php sendmail to send out newsletters from my backend
I have technical issue..
basically when sending there if any FAIL or BOUNCE then i dont receive the Failed Delivery Reports.

However if i send directly from my main mailserver (NOT using php sendmail) i.e i log on to mailserver.com and send there (it obviously uses a different sending system maybe smtp i dont know) then i DO RECEIVE the FAILED delivery reports u will have seen the classic MAIL DELIVERY SYSTEM.
Mail delivery failed: returning message to sender

So why is it not giving me the reports when i send using php sendmail from the backend?
All users with a real email address RECEIVE my newsletter so i know it works.

Maybe the php email script need adjusted? some technical settings there? is it to do with Return Path?

please fix this for me
that way i can clean my email lists and dont have to login to the mailserver directly (which is a pain)
Related categories: PHP Linux MySQL HTML SMTP