Hi there,
I have decided delete all authetication part from the email process auth, and first made the simplest configuration, so i have configured nginx based on the the examples provided into wiki nginx page and just modified it to get an IP address and hostname to redirect my users to my backends mail servers, Unfortunadly I got another 2 error messages :

upstream timed out (110: Connection timed out) while connecting to upstream, client: 192.168.122.1, server: 0.0.0.0:143, login: "ricardo.carrillo", upstream: 192.168.192.78:143


and

client was rejected: "MAIL FROM: <ricardo.carrillo@ine.mx>__" while in auth state, client: 192.168.122.1, server: 0.0.0.0:25

Does anybody knows what does those errors mean?