What is the easiest way to make new emails for new bnet accounts?

1) What do you do for multiple emails for bnet accounts?
2) Do you use +1, +2, +3 ect to use the same email?

Going to set up 8x accounts for rotw to solo farm and sell services.

I don't want to pay for a service.

Ty in advance.

if you use gmail you can just use + or .