Email won't send to own domain

I have asp.net pages that send an email when a person registers for the site. They send one email to the person himself, and they also send an email to the website owner telling him a person has registered.
The first email does work.
The second does not.
The interesting thing is that all this worked with my previous hosting company (before I moved to discountasp.net).
The second email (the one that doesn't work) is from the same domain as the website.
For instance, if my website (with the problem) is foo.com, then the email that won't get messages is [email protected].
I've sent email to [email protected] from my email program, and it works.
So the email address "[email protected]" is a working email address.
The problem seems to be that an asp.net page in foo.com can't send emails to addresses that are in the same domain (foo.com).

 

I am assuming that foo.com is an example you are using and that the domain name you are referring to is hosted on DiscountASP.
First check these things because they can affect how your email is delivered.

1. Make sure the email address (i.e. [email protected]) exists as a POP account on the DiscountASP email server.
2. If it does exists, make sure you do not have it setup to forward to anything else for now.
3. Go to http://www.allwhois.com/ and type foo.com on the text box. This will show you the WhoIS information and make sure that the name servers are pointing to DiscountASP's name server and no were else.
4. If the website is uploaded to the DiscountASP web server, make sure the SMTP server is set to LocalHost.