If you are using Google Apps, you will need to verify your domain with Google before you can use any of the Google Apps services. The automatic verification process does not work with Hover so here is how you would verify manually.
You can verify a couple of different ways: using a TXT record or using a CNAME record. You also need to add Google's MX records, and edit the "mail" CNAME record.
Note: Changes to your DNS records can take up to 24 hours to propagate throughout the Internet.
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