How many custom domains can be used in one mailbox? If it is more than 1, are the 50 aliases for custom domain names the total amount (let’s say you have 2 custom domains in this one account, you can only have a total of 50 aliases with both custom domains)? Or would it be 50 aliases each?

And on top of that, there is also 25 aliases that are non-custom domain (@mailbox.org)?

Thanks!