Not receiving HTML template emails in Outlook

I have designed a little HTML template in order to send dynamic emails to the costumer with the send e-mail smart service. But when it comes to outlook emails, the user doesn´t recieve the email.

There isn´t any problem on Gmail, I can see the email without any problem. I read that maybe some HTML tags doesn´t work on Outlook, but I do not even get the email.

Thanks!

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