Access to DATA (content) with SMTP access policy delegation

[Fraser Campbell <fraser@xxxxxxxxxxxxxxxxxxxxx>]

Hi,

I am wondering whether it is possible to access email headers and body content 
(i.e. the actual data passed with the DATA command) through access policy 
delegation.

I've enabled a policy service for smtpd_data_restrictions but it seems that 
there is no way to get at the actual email content from here.  These are the 
key value pairs I see (debug output from syslog):

  postfix/body_check-policyd[17709]: k=request v=smtpd_access_policy
  postfix/body_check-policyd[17709]: k=protocol_state v=DATA
  postfix/body_check-policyd[17709]: k=protocol_name v=ESMTP
  postfix/body_check-policyd[17709]: k=client_address v=10.142.254.1
  postfix/body_check-policyd[17709]: k=client_name v=blah
  postfix/body_check-policyd[17709]: k=helo_name v=blah
  postfix/body_check-policyd[17709]: k=sender v=blah
  postfix/body_check-policyd[17709]: k=recipient v=blah
  postfix/body_check-policyd[17709]: k=queue_id v=9729285
  postfix/body_check-policyd[17709]: k=instance v=4528.415d818f.0
  postfix/body_check-policyd[17709]: k=size v=295
  postfix/body_check-policyd[17709]: k=sasl_method v=
  postfix/body_check-policyd[17709]: k=sasl_username v=
  postfix/body_check-policyd[17709]: k=sasl_sender v=

What I'd hoped to do is implement spam/virus filtering based on the content of 
DATA ... any hope?  Am I nuts to try this?

Thanks
-- 
Fraser Campbell <fraser@xxxxxxxxxx>                 http://www.wehave.net/
Georgetown, Ontario, Canada                               Debian GNU/Linux