Infer user (mail address) from the pid of imapd process

on my server is installed Courier Mail Server. It happens that one imapd process uses tons of the system resources blocking the entire server. I would like to track down the user (i.e. the mail address in Courier Mail) that is running that process. Please note: not the linux user, but the mail address. Is it possibile to infer the email address of a process given the PID of a imapd command process? Thank you,