A customer's domain is currently controlled by another registrar. Since their webmail does not offer the featuers that NS does, the customer wants to just move the mail portion to NS.
I created a hosting package for the domain. I had the registrar change the MX record and CNAME records to point to Network Solutions, per NS support.

I created the email boxes for my customer. How do I assign the email hosting to the domain? I assigned http:\\xxxx.com to my hosting package. Do I also need to assign http:\\mail.xxx.com also for it to work?

You only need to create CNAMES for mail.xxx.com and smtp.xxx.com at your current registrar. Since the CNAMES redirect to the "netsolmail.net" address for your domain you do not need to create the subdomain here.

So assuming you have the two CNAMES (mail and smtp) and the MX record created at the other registrar you will be all set (other than creating the emailbox itself - which you said you did as well).

Thank you so much for this help.
I gave the other registrar the info below: (xxx represents real domain name of course).

MX Record XXX.COM. 10 INBOUND.xxx.COM.NETSOLMAIL.NET.
CNAME Record MAIL.xxx.COM. MAIL.xxx.COM.NETSOLMAIL.NET.
CNAME Record SMTP.xxx.COM. SMTP.xxx.COM.NETSOLMAIL.NET

They say they made these changes, but when I do the http:\\mail.xxx.com, I get a 'page can't be displayed' instead of the webmail interface. I can ping mail.xxx.com and it appears to be pointing to the netsol servers. They made the change 3 days ago, so it should be working. They say it is Network Solutions, but I don't see how to diagnose it. I called NS support and they are going to have an engineering team look at it tomorrow morning.
Is there a DNS check or some method I can determine what the problem is myself - if in fact they did the changes correctly? I just hate waiting as the customer is screaming that they have been without mail for 3 days.
Thanks for you help.

It appears they have the CNAME for mail.xxx.com wrong (if it is the domain registered with Abacus).

They are pointing mail.xxx.com to the MX (INBOUND...) record instead of CNAME Record MAIL.xxx.COM.NETSOLMAIL.NET.

If you use Unix (Linux) you can use the "DIG" command to look up CNAMES:

> dig mail.xxx.com

Or you can use your favorite search engine to find an "online dig tool".

I found a decent one here:

http://networking.ringofsaturn.com/Tools/d...in=mail.xxx.com

Thank you for your help. I ran the tool and now see what you described as the problem. I will contact the registrar to make those corrections. Thanks again.