Mails to old users

Hello,we have some old users that don’t work with us any more, so i would like that any message sent to their addresses will receive a warning mail saying that the user is no longer working in our company.

What’s the best way to realize that? We’re currently using Domino 8.5.1 68 bit on a Windows 2003 64 bit o.s.

Thanks for your help.

Subject: Old users

you can create an agent on the mailbox saying that the mailbox is decommisioned within 1 month, then remove the mailbox.