Smartforms Triggered as Email (PDF) Via Action Profile, How To Set sender Details??

Hi all,

Me sending service Quotation to customer as email by using action profile. problem facing here is, while sending email, sender name is going sy-uname so i was trying to set some default name in From address of mail body. Actually standard class and method which i used for this process is  "CL_DOC_PROCESSING_CRM_ORDER=>CRM_SRVORDER_EXEC_SMART_FORM" . In this method signature is_mail_sender is empty while processing and this parameter is used as importing parameter while calling FM "Function_Name" . Can any one give me some idea how to do this  customization.

call function function_name

          exporting

               archive_index        = is_archive_index

               archive_index_tab    = ct_archive_index_tab

               archive_parameters   = is_archive_parameters

               control_parameters   = control_parameters

               mail_appl_obj        = is_mail_appl_obj

               mail_recipient       = is_mail_recipient

               mail_sender          = is_mail_sender

Thanks all,

Anbu