EWS read notifications to other mail account

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C#

EWS

i´m using this to get the read/not read notification of a campaign mail.

MailMessage msg = new MailMessage(ece.emailEmisor, destinatario, ece.emailAsunto, ece.emailCuerpo);
msg.Headers.Add("Disposition-Notification-To", "xxxx@xxxx.com");

it's works ok! but then i had to changed to Exchange.

EmailMessage msg = new EmailMessage(ews);
ExtendedPropertyDefinition PidTagReportName = new ExtendedPropertyDefinition(0x003A, MapiPropertyType.String);
ExtendedPropertyDefinition PidTagReportEntryId = new ExtendedPropertyDefinition(0x0045, MapiPropertyType.Binary);
Byte[] ByteVal = HexStringToByteArray("00000000dca740c8c042101ab4b908002b2fe18201000000000000002f6f3d4669727374204f7267616e697a6174696f6e2f6f753d45786368616e67652041646d696e6973747261746976652047726f7570202846594449424f484632335350444c54292f636e3d526563697069656e74732f636e3d656462616e746900");
msg.SetExtendedProperty(PidTagReportEntryId, ByteVal);
msg.SetExtendedProperty(PidTagReportName, "xxxx@xxxx.com");

this code is not working. i don't know how to generate the hex code. the example hex send the mail but not return the confirmation notification.