Assertion: email | /r/HasProperty | opened
Facets:
Source sentences:
text: If an email contains web bugs (inline content from an external server, such as a picture), the server can alert a third party that the email has been opened.
text: However, Wired stated that the new change means senders can track the time when an email is first opened, as the initial loading of the images requires the system to make a "callback" to the original server.
text: Malware such as Klez and Sober and many more modern examples often search for email addresses within the computer they have infected, and use those addresses both as targets for email, but also to create credible forged From fields in the emails that they send, so that these emails are more likely to be opened.