As of December 2012, Hotmail appears to have removed this header field.

Most programs will just show the recipient's address in the header field, or display the line "recipient list suppressed."

A specific header field indicates which of the possible keys is to be used.

Spam Cop dissects the message's header field to find out where it came from.

Usually descriptive information is also added, such as a subject header field and a message submission date/time stamp.

The remaining header fields and the data are then transmitted at 802.11n speeds.

The user can edit all header fields when composing a follow up.

They differ from ordinary posts by a header field named .

For control message a special format is required since the essential information is in the header fields.

A vouched sender should add a header field to the messages it sends.