Add sender IP on the header

[Iker Perez de Albeniz]

Hi,

I'am trying to add a new header to all input messages with a label like
this:

X-Send-IP: senderip

i have tried something like this (in main.cf):
smtp_data_restrictions = check_lcient_acces cidr:/etc/postfix/add_header

and add_header file is like :
0.0.0.0/0     PREPEND          X-Send-IP: ${client_addr}

but dont work..

any idea?