I've read that I should use email subaddressing when registering for web sites. For example, if my email address is
firstname.lastname@example.org, then, when registering for
somesite.com, I should use the email address
How effective is this at controlling annoying emails from
somesite.com (or, in the extreme, outright spam)? What is to prevent
somesite.com from stripping the
+somesite tag and sending directly to
email@example.com? Is email subaddressing something that I should bother to use, or are the benefits limited?