If you want a custom email address for the domain you use for your Squarespace site, you have a few options. For example, if your domain is sampledomain.com, you can get a custom email address like email@example.com.
To follow these steps, you must already have a domain registered or mapped to your Squarespace site.
That is correct. WordPress.ORG software does not have any interaection with the web server or email system like that. WordPress.COM does becuase it's a completely different system and that support has been added in there. As a general note, not a lot of what's discussed on the .com forums can be translated to a .org site so you're best off forgetting most of what you see there.
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