This process is not trivial, as you would have to install a mail server like Dovecot in the VM, which is something I do not recommend you. My experience with other DNS providers is that, apart from giving the domain name, they also have a webmail service. This way you would not have to install any mail server as the providers already gives you one. Could you check if this is something dynu provides?
Javier J. Salmerón
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