Cannot receive emails from PayPal? Check your MX settings

Recently we had a problem with a domain we own: we were able to receive emails from anyone but PayPal, including “you have received a payment” notifications. After some research we discovered that the MX server listed in the DNS settings of the domain was under the form of a plain IP address, without hostname. It was sufficient to replace it with the domain name (in our situation we had the mail server on the same physical machine of the web server) to get it fixed.

If you’re experiencing the same problem, just take a look on under “MX Records” if you get any warning about RFC compliance.

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