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You can, however, get a similar effect by forwarding all your mail to your Gmail account and configuring it to send mail as your domain email address (including using your SMTP server if necessary).

Definitely a wise move to use your own SMTP server, or you'll end up with "From: ___@gmail.com on behalf of ___@yourdomain.com"[1].

[1] http://gmailblog.blogspot.co.uk/2009/07/send-mail-from-anoth...

It has been hidden, but not discontinued. You can still create a trial Google Apps account, and then "downgrade" to free account with 10 user limit

Not to mention the fact that you can still get excellent Outlook.com webmail with your own domain for free.