SAP Email

Hi All,

Iam using SO_DOCUMENT_SEND_API1 to send email from SAP. The problem is when i released using SOST Tcode status text is " No delivery to sender address invalid recipient" i think this is because of i did't not maintain RFC destination for sender address...here is the code... for sendaddress iam concatenating sysid and objid...i think i want to maintain RFC for objid to identify the sender...

CALL FUNCTION 'SO_DOCUMENT_SEND_API1'

EXPORTING

sender_address = sendaddress

sender_address_type = 'SMTP'

Can anyone give me the solution...