Right now i am using Open Souse version of Zimbra, Its possible to create temporary id, which means if i want to create a mail for traniee, it should work for specified period, ie, for one month depending upon his grade and category.

For example, A new HR-Traniee, joins the concern means, i have provide him ID which will work only 1 month, and after that no mail should be sent using this mail id.