Details of emails, phone calls and activity on social networking sites would be stored, but not the message content.

Those who provide or host the services they use are entitled to seek ways of increasing their revenue, and the screening message content may be one of those ways.

X.400 message content standards are defined for communication between user agents.

However, attended and unattended information pass through the filter, to a second stage of selection on the basis of semantic characteristics or message content.

Researchers can also collect information on the number of messages, the size of messages, the message content, and message threading.