tengo instalado en mi server
debian+postfix+dovecot+mysql+amavis+spamassasin y me esta dando este error cuando una cuenta en particular quiere enviar correos

was considered unsolicited bulk e-mail (UBE).

Our internal reference code for your message is 10927-06/wcB6Gq4DgOYD

The message carried your return address, so it was either a genuine mail
from you, or a sender address was faked and your e-mail address abused
by third party, in which case we apologize for undesired notification.

We do try to minimize backscatter for more prominent cases of UBE and
for infected mail, but for less obvious cases some balance between
losing genuine mail and sending undesired backscatter is sought,
and there can be some collateral damage on either side.

First upstream SMTP client IP address: [127.0.0.1] localhost.localdomain
According to a 'Received:' trace, the message apparently originated at:
  [127.0.0.1], 10.0.0.7 localhost.localdomain [127.0.0.1]

Return-Path: <xxxxx@xxxxx>
From: =?UTF-8?Q?Luisa_I_Morales_Rodr=C3=ADguez?= <xxxxx@xxxxxx>
Message-ID: <0xxxxxx@xxxxxxx>
Subject: Fwd: divulgar

Delivery of the email was stopped!

Saben q causa puede ser eso?




---
Jessy Hernandez Vidal            | Telefono:8612512
Jefe de Grupo de Informatización | email: je...@arnac.cu
Archivo Nacional de Cuba(ARNAC)  | jabber: jessys...@jabber.arnac.cu
Compostela # 906 Esq. San Isidro.| web: www.arnac.cu
Habana Vieja, Cuba.              |
                **** Linux Mint 17 Qiana****
   Evite los virus. Use linux o Hierva el ordenador antes de usar.


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