change password expiry in zimbra mail account

To change the password expiry time for a zimbra mail account, please follow the steps below.

[zimbra@geo ~]$ zmprov ma geo@geobaby.in zimbraPasswordMaxAge 36500

This modifies the value. To see if the new value is set, use the command:

[zimbra@geo~]$ zmprov ga geo@geobaby.in zimbraPasswordMaxAge
# name geo@geobaby.in
zimbraPasswordMaxAge: 36500

This can also be done from admin panel, goto account >> edit >> advanced >>  Maximum password age (Days).

http://www.zimbra.com/forums/administrators/35696-password-expiry-email-notification.html