Get a copy of email sent by null sender

[Alexandre Ellert]

Hello,

I often use sender_bcc_maps to audit suspicious account and it works great.
Today, I need to have a look at email sent by null sender <>

Here is my relevant configuration :

# grep sender_bcc_maps  /etc/postfix/main.cf
sender_bcc_maps = regexp:/etc/postfix/sender_bcc_maps

# cat /etc/postfix/sender_bcc_maps
# This one usually works fine
#/^u...@example.com <mailto:u...@exemple.com>$/         au...@example.org
/^$/                                                    au...@example.org
/<>/                                                    audit@example. 
<mailto:au...@exemple.com>org

Thanks for your help.

Alexandre