How do I get outlook to automatically insert sender email address

[robin]

when new messages are clicked the from: line is blank. Outlook used to
automatically insert sender's email in the from: line

 

[Vanguard]

when new messages are clicked the from: line is blank. Outlook used
to
automatically insert sender's email in the from: line

So is the From header (E-Mail Address) actually non-blank in the
definition of the e-mail account?