getting mails--addressed to somebody else?

[Vijay Mahajani]

URGENT PLEASE.

Dear friends,
I have Red Hat 5.2 mail server configured with  64kbps leased line.
The problem is some of the users are getting the mails which are not
addressed to them .
Please tell me why this is happening and how this problem can be solved
.
Thanking You,

REGARDS,
Vijay.