Many of you may know about Gmail's plus trick. It's a relatively
old but effective trick for spam prevention. You'll be surprised to
know that this trick also works in Hotmail.
Suppose you have an email address like firstname.lastname@example.org.
If you add a '+' sign after your email username, Hotmail will
disregard anything between the + and @ signs. Emails sent to
email@example.com will still reach your Hotmail
This is a very good method for tracking spammers. Let's say you
used an email alias like firstname.lastname@example.org for signing
up for a forum. Now whenever you receive spam addressed to the
above alias, you'll know the exact site which sold your email
address to the spammers.
To get rid of the spam coming from the alias, you can use
Hotmail's Sweep feature to delete all the messages addressed from
that source and automatically block them from appearing in your
inbox in the future.