If you have added the web address (URL) of your Gmail inbox to your browser bookmarks, make sure that the bookmarks are not getting synched with a public service like Delicious or Google Bookmarks.
That’s because when you bookmark your Inbox or any other folder in Gmail, your email address is added to the title of the bookmark. When this bookmark becomes public, your email address automatically gets exposed to spam bots.
This may sound like an obvious thing but just search for “mail.google.com” or “Gmail Inbox” on Delicous, Xmarks or even Google Bookmarks and you’ll tons of “working” email addresses in the title of the bookmarks.
The same is also true when you are bookmarking individual emails.