Tommy,

Xeams already does that. Try the following:

• Log in as "admin" to your web interface
• Click "Tools" (the actual link on the menu - do not click any sub-item under the menu)
• The next page will display several tools. One of them will be DNS Lookup.
• Try doing a DNS Lookup on carrefour.com
• You should see a confirmation saying it supports SPF
• If you don't see that confirmation, use a different DNS server on the machine where Xeams is installed.