To get your email for castamodel.com going to the right place, you need to update your DNS settings.
1. Sign in to your account with your current DNS host.
2. In your account, find your DNS settings.
3. Add the following DNS records
TXT Record
Name: @
TXT Value: MS=ms65736675
Name: @
TXT Value: v=spf1 include:secureserver.net -all
CNAME Record
Host: autodiscover
Points to: autodiscover.outlook.com
Host: email
Points to: email.secureserver.net
MX Record
Host: @
Priority: 0
Target: castamodel-com.mail.protection.outlook.com
4. Return to this page, and then select
I’m Done.