Email Problem (Distribution lists)

Hi Experts,

I have a program which sends emails using the FM 'SO_OBJECT_SEND' to a single email id and a distribution list.

When any one of the distribution list recieves the mail, he/she is unable to see who are all the reciepients for this mail(As is the case in BCC).

Peculiarly, this problem is not there in my DEV system but exists in Production system.

Can you please help me out in this regard.

Thanks,

Ravi