Junk Mail in Admin Mailbox

Use Spam software (need to pay it)...
Or, use rules to delete these messages, you could do it on sender domain, subject,...

This is not really SPAM...These are the messages that are intended for some receipients that are no longer with my company and I have deleted their accounts. It comes in as an Undeliverable message and says that bla bla bla mail did not reached the specified receipient ( becoz there is no such e-mail address anymore.)
Hope this clears up my question.

you can create an automated response that is sent to the sender of the email notifing them that that person is no longer with your company. That may or may not stop your 2000 emails or substantially reduce them. Depends upon whether the incoming arespam or legit. You can also use filter software to block incoming email by the no longer with the company users email address.

The best way one can think of working around this would be to use a Server-side rule for the Admin mailbox which can be set to "Delete" Mails - if "specific words are in body of mail" - where you can specify the statement / words that are commonly appearing in your mails that u want to delete.
These mails might pile up in your "Deleted Items" folder in the default mailbox on that pc, which can then be cleaned off once in a day or two.
Hope this helps.
Cheers.

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