Thank you for contacting us about upgrading to a Power Hosting account. Yes, you can upgrade your hosting plan directly in AMP, this will prorate the price based on what you have already paid.
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I'm sorry you're having issues with your SPF authentication. Please reach out to our live support. They will be able to take a closer look and assist you with the issue. Please give them as much information as possible. You can also check out our Guide to SPF Records article.