My father in law just recently passed away. Im trying to help my mother in law pay bills and get access to email accounts, etc.

He was an IT guy, and he had to email domains that he paid for (i guess). His widow has lost access to her primary email, which was one of these two domains.

My technical knowledge of emails and networking is super low, so how do I go about getting access to an email account? Where do I start?

I know he has an email server, so far I’ve only managed to access his work laptop.