Later this +postfix makes it easier to find out which source is the leak.
Most of the websites let you sign up with "+" in your e-mail but unfortunately not every site.
The other trick is that GMail ignores "." in email user so my.name can be just as well "myname". Not that it helps with the spam, just a sidenote.
However, the problem with using the "account+identifier" is that the identifier is simply ignored when delivering mail. With a real alias I can actually revoke an email address, by simply removing it from the aliases. With an identifier I would have to explicitly reject mails for a given recipient part.
I prefer to keep things simple. Bouncing spam is a bonus.
gam create alias idontwearseatbelts user crashtestdummy
[0] https://code.google.com/p/google-apps-manager/wiki/GettingSt...