I haven't used Windows Live Domains. But I have used/use Google Apps.
You use a Google Apps setup just like a GMail setup. To receive mail you should be using the webmail interface or a mail user agent that supports GMail: (that means IMAP or POP). Thunderbird's my desktop client of choice, and it has support for adding a GMail account with a few pretty little customizations IIRC, right out of the box.
If you specifically want a command-line mail client, you'll need something that can access GMail via either IMAP or POP. I think alpine works (here are instructions), but can't really give you many choices. I only use command line mail clients for local logging mail, not external "real" email.
The question you linked describes sending mail (that's what SMTP is for). In my case, I'd use a setup like that so system daemons or personal programs could easily send email. It wouldn't be for personal email use.