Accept email with Postfix no matter what domain

I'm working on an application which only accepts email coming from the google mail servers. The challenge is, the applications doesn't know, upfront, which domains to accept and so i need Postfix to accept email from all domains.

• This is the end point for all email, no relaying being done

• Only accept mail from the Google Apps servers:

  dig txt _spf.google.com | grep spf |format_spf.py > /etc/postfix/network_table
  mynetworks = hash:/etc/postfix/network_table
  smtpd_client_restrictions = permit_mynetworks, reject
  

• Email not accepted by any local alias is being forwarded to a catch-all user where it is processed by procmail:

  luser_relay = catch-all-user
  mailbox_command = /usr/bin/procmail -Y -a $DOMAIN
  

• At this point i can't accept mail without a table containing the domains:

  mydestination = hash:/etc/postfix/mydestination_table
  

So, how can i get rid of the "mydestination" table?

Thanks.

You mean you want Postfix to be an open relay?

This could solve this problem:

smtpd_client_restrictions = permit