Parses address lines of the message headers into their respective header indices in the Mail_IMAP::$header property.
Warning: As a method used internally by Mail_IMAP, Mail_IMAP::_parseHeaderLine should not be used directly. Its API has the potential of being changed in future releases, should I find a more efficient approach.
| param | int | &$mid The message id. |
| param | str | &$line The header line itself. |
| param | str | &$name The name of the header line. |
| return | void | |
| access | private | |
| see | Mail_IMAP::getHeaders | |