Are you afraid of getting spammed when you provide your email address?
Gmailsupports "
plus-addressing" -- just add a plus sign "+" and a word before the "@" sign to create as many new email addresses as you want.
For example, if your email address is "user@gmail.com", mail sent to "user+newsletter@gmail.com" will also reach you. Later, use Gmail's filters should that address fall into the wrong hands.