The headers, subject line, recipients are not encrypted. There's probably enough...

		ams6110 on June 3, 2014 \| parent \| context \| favorite \| on: End-To-End – OpenPGP Chrome extension from Google The headers, subject line, recipients are not encrypted. There's probably enough info in the subject line and recipients and corpus of other recent subject lines sent among those recipients to still do a halfway decent job at targeting ads.