Looks like .cyou is currently the cheapest TLD at $0.65 per year for renewals. There are a lot of other options for just a little bit more. If you can afford it, pay for 10 years in advance.
One domain can be used by an unlimited amount of mailboxes.
Regarding DKIM etc, most email providers will help you with that.
GMail is only a "no brainer" if you don't care about privacy or until Google locks you out.
Looks like .cyou is currently the cheapest TLD at $0.65 per year for renewals. There are a lot of other options for just a little bit more. If you can afford it, pay for 10 years in advance.
One domain can be used by an unlimited amount of mailboxes.
Regarding DKIM etc, most email providers will help you with that.
GMail is only a "no brainer" if you don't care about privacy or until Google locks you out.