Mike Cardwell: DNS Pre-fetch Exposure on Thunderbird and Webmail
‘When you view an email in Mozilla Thunderbird, it looks at each of the URLs in the body, and does a DNS lookup on each of the domains. It does this so the page loads faster if you click on the link. It doesn’t just happen on HTML emails, it also happens for plain text emails. Viewing the body in “Plain Text” mode rather than the “Original HTML” or “Simple HTML” modes doesn’t prevent it either. This also happens when using webmail clients like GMail and Hotmail….’
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