Thunderbird, IMP, Roundcube as well as Hotmail and Gmail (when still in http mode) perform a DNS lookup on all hostnames in URLs inside the message - regardless of format or whether image display is on or not. As Justin Mason wrote, this is a very bad idea.
Diederik van Liere, a postdoctoral researcher, analyzes Bugzilla data (for Firefox and Thunderbird) for patterns concerning community size and bugfixing patterns.
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chris @ February 4, 2010