Hi, I haven't seen anyone post this before; from Zimbra 5.0beta2, Zimbra is using Nginx as their IMAP/POP proxy. From the release notes : "More scalable POP/IMAP proxy. NGINX is the IMAP/POP proxy server that is now configured. If you have IMAP/POP proxy server configured, the change to NGINX is automatic." Congrats :) Regards -- Denis