Sap send mail function is not correct.

Hi all,

I have one issue like below:

I have one program using to send .pdf file and this program run in background mode.

When the program send file .pdf to user,in my case  about 100+ users and not all of them receive the email. But if i send by individual and it was fine.

My function module using to send mail : SO_NEW_DOCUMENT_ATT_SEND_API1.

Any help would be very appreciated.

Thanks,

SapViet