(registration) email to user

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   Hi,

I do have a problem with sending email to users, it happens when users register themselves and when I want to send an email to a user from the memberlist.
The registration email send to the site admin works fine.
Can anybody tell me what is going wrong?
The following error occures:

Server Error in Forum Application
An error has occurred while sending an email.
Please contact the forum administrator.

Support Error Code:- err_Access_send_mail_footer
File Name:- functions_send_mail.asp

Error details:-
jmail.Message
The message was undeliverable. All servers failed to receive the message