I used to use this company-i-buy-from strategy, but i got accused of fakery a lot, until I tried a new strategy -- interest@domain.dev. So if i were buying from REI, i would use camping@domain.dev or if i were ordering office supplies i would use officemgmt@domain.dev. It's slightly less obvious what you're doing, and raises fewer questions.

People will still ask if you work in the 'interest' sector, but it is still better than having to explain why their company name is in your e-mail address.