smartform mail to external id

Hi,

I'm using FM ' SO_NEW_DOCUMENT_ATT_SEND_API1 ' to send mails to sap id. but when i tried it, giving non sap id i.e. external mail id, it did not deliver.

Please tell me what is the procedure to send mail to external id's?.

Also tell me how to create a distribution list with multiple user-id's in SAP.

Regards,

Subbu.