onHeader (event)
Fired for every message header being retrieved.
Syntax
- (void)onHeader:(NSString*)field :(NSString*)value;
func onHeader(_ field: String, _ value: String)
Remarks
The Field parameter contains the name of the 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).