Header Event
Fired every time a header line comes in.
Syntax
pimap.on('Header', [callback])
Callback
The 'callback' is called when the 'Header' event is emited.
function(e){ }
The argument 'e' has the following properties:
e.field e.value
Remarks
The Field parameter contains the name of the HTTP header (same case as it is delivered). The Value parameter contains the header contents.
If the header line being retrieved is a continuation header line, then the Field parameter contains "" (empty string).