Error en Zimbra - mail.SEND_ABORTED_ADDRESS_FAILURE

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Buenas taengo este problema quien me podra ayudar urgentemente

method:[unknown]
msg:Invalid address: Yezid <ymendoza@incostas.com>. com.zimbra.cs.mailbox.MailSender$SafeSendFailedException: MESSAGE_NOT_DELIVERED; chained exception is: com.zimbra.cs.mailclient.smtp.InvalidRecipientException: RCPT failed: Invalid recipient ymendoza@incostas.com: 451 4.3.5 <gpena@incostas.com>: Sender address rejected: Server configuration error
code:mail.SEND_ABORTED_ADDRESS_FAILURE
detail:soap:Sender
trace:qtp649734728-194:1490987703125:57c9da61c6ff3169
request:
Body: {
  SendMsgRequest: {
    _jsns: "urn:zimbraMail",
    m: {
      did: "9222",
      e: [
        // [0]:
        {
          a: "ymendoza@incostas.com",
          p: "Yezid",
          t: "t"
         },
        // [1]:
        {
          a: "gpena@incostas.com",
          p: "Gustavo A. Pena M.",
          t: "f"
         }
       ],
      id: "9222",
      idnt: "e507d659-dc57-4390-bf4d-63ec46a2057a",
      mp: [
        // [0]:
        {
          ct: "multipart/alternative",
          mp: [
            // [0]:
            {
              content: {
                _content: ""
               },
              ct: "text/plain"
             },
            // [1]:
            {
              content: {
                _content: "&lt;html&gt;&lt;body&gt;&lt;/body&gt;&lt;/html&gt;"
               },
              ct: "text/html"
             }
           ]
         }
       ],
      su: {
        _content: "Test"
       }
     },
    suid: 1490984880418
   }
 },
Header: {
  context: {
    _jsns: "urn:zimbra",
    account: {
      _content: "gpena@incostas.com",
      by: "name"
     },
    authToken: "(removed)",
    csrfToken: "0_e4a6f4f8f71529e00ef933290685c371436079e1",
    notify: {
      seq: 1
     },
    session: {
      _content: 1257,
      id: 1257
     },
    userAgent: {
      name: "ZimbraWebClient - GC56 (Mac)",
      version: "8.7.0_GA_1659"
     }
   }
 }



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Según el log de error: 

Imagen de deathUser
Según el log de error: 
RCPT failed: Invalid recipient ymendoza@incostas.com: 451 4.3.5 <gpena@incostas.com>: Sender address rejected: Server configuration error

El recipiente o receptor (ymendoza@incostas.com) no es válido y también dice que el sender (gpena@incostas.com) quien envía el e-mail ha sido rechazado, ambos usuarios son locales a zimbra ...???

maneja zimbra el dominio incostas.com, existen ambos usuarios ...???

bye
}:-)