CCing another persons while sending mail to external world

Hi I am facing problem while marking a CC to other persons during sending mail to external world.

I am trying with the following logic.

itab_reclist-receiver = 'abc@yahoo.com'.

itab_reclist-adr_type = 'U'.

itab_reclist-adr_flg = ''.

APPEND itab_reclist.

itab_reclist-receiver = 'pqr@yahoo.com'.

itab_reclist-adr_type = 'U'.

itab_reclist-adr_flg = 'C'.

APPEND itab_reclist.

itab_reclist-receiver = 'lmn@yahoo.com'.

itab_reclist-adr_type = 'U'.

itab_reclist-adr_flg = 'C'.

APPEND itab_reclist.

This values will in turn be passed to fun module ZSENDEMAIL, and over there it will resolve adr_flag = 'c' as copy functionality.

But as a result all these three receipients received same mail thrice instead of one single mail.

Also can you let me know the use of EXPRESS field while sending a mail??

can you please help me out for the same?

Thanks i Advance

Jigar