as I can solve this problem? The error is Ambiguous Recipient. Thank you very much, Marcos. The following recipients did not receive the attached mail. Reasons are listed with each recipient: <manuel.yong@xxxxxxxxxxx > manuel.yong@xxxxxxxxxxx MSEXCH:IMS:MUNDO-R:ASSCCEXSIT:CORRE-R 0 (000C0595) Ambiguous Recipient The message that caused this notification was: