I'll reply to my own post. Here is what I did to let my POP users log in with their unqualified alias :
- installed a zimbra-proxy on another server with IP address xxx.xxx.xxx.xxx
- then "zmprov modifyDomain sub.domain.com zimbraVirtualIPAddress xxx.xxx.xxx.xxx" on the main server
Now the users can log in with "alias" instead of "alias@sub.domain.com" if they use the pop proxy which has the IP address xxx.xxx.xxx.xxx. |