Before we start, there are three ways to do this.
Generally the best and easiest email solution is to fetch emails for your new domain to an existing webmail account e.g. gmail. You then get all your email in one place.
Alternatively you can set up mailboxes for each email address, you then become responsible for checking that email. This may mean you have to check emails in multiple places.
You can also forward emails for your new domain to an existing webmail account, but it is not the best way. Use the fetch method instead.
Perhaps you are looking for how to set up gmail to send emails from You@YourDomain
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