Henrik Gemal reports that safeguards against phishing have been checked in to Mozilla Thunderbird. In builds with this feature, Thunderbird will display a confirmation dialogue when the user follows a link in an email to a site that looks like it might be part of a phishing scam. The dialogue is currently triggered when visiting a URL with a numeric IP address instead of a domain name or a URL that does not match the address displayed in the message's link text. Other detection methods may be added in the future. A screenshot of the two dialogues is available.