GMail using SPF and another odd feature

I logged into my GMail account today and noticed that a message from a Yahoo! user account was authenticated using SPF, or Sender Policy Framework, and was marked as such when you click “More options”. They’ve probably been doing this for a while, but I only just realised.

Another thing they’ve got going is user aliasing… for example, I signed up for “josh.street” and received an email to JoshStreet (and since email addresses are effectively lowercase, that means joshstreet). Obviously I’m not posting my email address in parsable format (because spammers have programs to harvest email addresses off websites), but the domain is gmail.com, so that’s not too hard to figure out if you want to send me email now is it?