> Ask them what they want, do what the want, cash the check.
That person is very much not tech-savvy, and I consider my role to help them find out what they need (not "want"). (Also, there's no check involved - this is a friend of someone in the family, I'm doing this for free.)
For example, they don’t want your role to be setting up a gmail account even though that would make the spam problem mostly disappear (and avoid a bunch of other email footguns) so you aren’t doing that.
Even though they need a gmail account because potential customers will expect and accept it.
And if your client already has email and use it, they already have practice dealing with spam because putting an email address on the web hasn’t been necessary to attract spam for a couple of decades.
Our organisation considers Gmail addresses as "suspect" when processing orders.
Gmail itself is hard to deal with as a company address when integrating to internal systems (they keep changing things.)
I personally would strongly caution against using a Gmail address for your company.