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You can have as many domains as you want for free in your Fastmail account. There are no extra fees.

I've used them for 20 years now. Highly recommended.

Wait, really? I pay for two separate domains. What am I missing?

I'm happy to pay them because I love the service (and it's convenient for taxes), but I feel like I should know how to configure multiple domains under one account.

Under Settings => Domains you can add additional domains. If you use Fastmail as domain registrar you have to pay for each additional domain, of course.

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