how to add warning / banner in email body ?

[Jayesh Shinde]

Hi ,

For identifying external world  & spoof emails ,  I am looking for 
solution where we can add notification / warning banner in email body 
like below  .

"_This e-mail is received from external domain. Please review before 
opening any attachment or link_"

This will help end  user to identify risk while reply  or URL click .

Is there any milter or postfix solution available where we can set 
condition and then above warning will get append at the starting of 
email  ?
or is there any way to append disclaimer  at the starting of email ? I 
checked alterMIME & MailScanner which are adding disclaimer at the 
bottom of
email , I am looking to add it on starting of email.

I want to do it only for clean incoming emails which come after MX pointer .

Thanks You

Regards
Jayesh Shinde