E-mail sent on Wednesday with no reply, so far.

I will explain the problem more in detail just in case someone in the community knows the answer:

I started working with NINOX with a personal e-mail (xxxxxxx@yahoo.com), but after upgrading, I need this sing-in address to be the professional one (mail@proffesional.com).

The reason is that I need to send professional emails from my databases, and I’ve realised that the sender field of these emails contains the owner’s address, which I do not want to be disclosed since, as I mentioned above, it is the personal one.

I would very much appreciate any indication on how to do this.
Thank you very much in advance