[Dovecot] post-login script and original remote ip in proxy mode

Hi,

I am running dovecot on 3 qmail-ldap server backend. dovecot configured to use auth_pop3 wrapper for authentication. Users logins to the qmail-ldap pop3&imap pools randomly. If a user is mailhost is not the connected server, dovecot proxies the connection to the user mailhost. In this case, I can not get the original client IP address via post-logins script on user host. I see only the first connected server IP as $IP environment.

Any idea to get original client IP in this setup with postlogin scripts?

Thanks