The Yahoo! Personals Mailbox uses state-of-the-art software to provide you with one of the most secure messaging experiences on the Web. Some of the safety features include:

• The service is firewall protected.
• Your mailbox can't be bookmarked.
• In most cases, the "Back" button will not work.
• You can clear your browser's cache.

When you reply to a personal profile, you're sending a message from your private Yahoo! Personals Mailbox to the Yahoo! Personals Mailbox of the user who created the profile. The same process happens when you reply to a message that you've received in response to your own profile.