That's because spammers apply another technique to find email addresses, too. They simply guess. Given a domain name, spamware will send mails to all kinds of (likely) user names at that address, from aaaronb@ to zzziddyw@.
You can escape this attack of brute force like you can (try to) escape somebody guessing for your password. Try to make your address as difficult to guess as possible when selecting your user name.
Long, Complicated Email Addresses Beat Spammers
To beat spammers, use a
- long email address
- consisting of more than one word
- and, preferably, word segments as well as
- numbers and
- an underscore.
Of course, there's no point in constructing an email address that is impossible to guess for you, too, on odyssey to spell over the phone and hard to type for your friends.