A different one than the article but also weird/dangerous, it (was? is still?) possible to manipulate someone else's contact identifiers.<p>This may have been fixed, but I stopped using gmail years ago so I'm not sure..<p>For example imagine Alice emails Bob and Chad, and in the To: field for Bob she gives Bob a different "Name" like "Brad" <bob@bob.com>. If Chad replies to this email, Bob will now be in his contact list as Brad. The email is still bob@bob.com but you can see how it could be malicious, or at least fodder for fun pranks.