Mail server error

Hi to all,

I installed debian linux on my server to serve our website. however I
have
problem setting up our mail server. I have tried everything I can for a

month just to solve my problem but did not came up to a good result. If

there would be anyone willing to help me I would be very glad.

My current system runs apache, mysql and php. I have sendmail installed
and
squirrelmail to read the imap server. I'm using courier-imap. I can now

logon using my account name to squirrelmail but I can't send/receive
email.

In squirrelmail there is an option to use SMTP or Sendmail. If I use
sendmail to send email it doesn't give any error but the email doesn't
arrive to the destination. If I use SMTP this is the error I received:

Requested action not taken: mailbox unavailable
Server replied: 550 5.1.8 reject sender 'jaypee@webserver'.
5.1.8 Sender address target domain 'webserver' is not valid.
5.1.8
5.1.8 There is a serious error of some kind at your end which we cannot
5.1.8 correct or compensate for at this end. Please forward this
message
5.1.8 in its entirety to your own LOCAL postmaster and ask them to
5.1.8 correct the problem for you.
5.1.8
5.1.8 Postmaster@[127.0.0.1]: Please contact <postmaster@Knoppix> (via
5.1.8 an unblocked server of course!) if you need assistance in
resolving
5.1.8 this issue. You must include your IP number, given above, in
order
5.1.8 to receive any help at all. Including this entire status reply is

I would like to know how to solve this problem. One thing that bothers
me
also is my conection to the internet. We are using modem/router
(speedtouch)
and I just configure the modem/router to redirect it to my local
machine
(i.e. our webserver). But there's no problem with it on our webserver.
I
just don't know if there is something to configure in our mail server
to
pass through our modem/router.

Thanks in advance for any help.

.

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