Information from customers does not come

Hey.
Help to deal with the problem. I have a website https://alfalcolombia2017.com/ , customers who order services write their contact details and they come to the post office. At first everything was fine, we checked in test mode. After a month, notifications by mail do not come. We checked, wrote our contacts to check and they do not come to the mail. Although everything was as it was in the settings. What could be the problem?
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