Mail "life span" and dead mail

[xamel2001]

Question 1:

I'm using Lotus Notes 504 on Windows platform. I would like to know, how long does a mail will be kept in the server?(in cases such as the sending address does not exist,etc.)

Question 2:

I would like to know how to automatically delete a dead mail, say after 24 hours or so. I found out that the Agent function can be used but I'm not so sure on how to identify a dead mail in the Agent function.

Thanks in advance.