Swift_Mime_Headers_AbstractHeader | --Swift_Mime_Headers_PathHeader
Located in File: /vendors/swiftMailer/classes/Swift/Mime/Headers/PathHeader.php
Null is returned if no address is set.
This is not necessarily RFC 2822 compliant since folding white space will not be added at this stage (see toString() for that).
This method returns a string email address.
This method takes a string for an address.