Thanks to everybody for the responses. The winning solution was Ricks (see below) which worked like a charm after poking a suitable hole in my firewall. Miark > [To listen to port 2525], in /etc/postfix/master.cf file, > locate the lines that look like this: > > smtp inet n - n - - smtpd -o cleanup_service_name=pre-cleanup > > Add the following lines right after them: > > 2525 inet n - n - - smtpd -o cleanup_service_name=pre-cleanup > > Then just do a 'postfix reload' and you should be in business.