Hola chicos tengo un problema y es el siguiente:

Thu 2008-07-10 12:22:44: [8761:1] Parsing Message
Thu 2008-07-10 12:22:44: [8761:1] From: correoA@dominioA.es
Thu 2008-07-10 12:22:44: [8761:1] To: correoB@dominioB.es
Thu 2008-07-10 12:22:44: [8761:1] Subject: prueba correo
Thu 2008-07-10 12:22:44: [8761:1] Message-ID: <MPEOIMLIEKMEHIMLHCJECENNCCAA.correoA@dominioA.es>
Thu 2008-07-10 12:22:44: [8761:1] MX-record resolution of [dominioB.es] in progress (DNS Server: 195.235.113.3)...
Thu 2008-07-10 12:22:44: [8761:1] * P=005 S=000 D=dominioB TTL=(436) MX=[mx.relay.orange-business.com] {194.2.0.84}
Thu 2008-07-10 12:22:44: [8761:1] Attempting MX: P=005 S=000 D=dominioB TTL=(436) MX=[mx.relay.orange-business.com] {194.2.0.84}
Thu 2008-07-10 12:22:44: [8761:1] Attempting SMTP connection to [194.2.0.84 : 25]
Thu 2008-07-10 12:22:44: [8761:1] Waiting for connection...
Thu 2008-07-10 12:22:44: [8761:1] Connection established (192.168.1.70 : 4705 -> 194.2.0.84 : 25)
Thu 2008-07-10 12:22:44: [8761:1] Waiting for protocol initiation...
Thu 2008-07-10 12:22:44: [8761:1] <-- 220 smtp39.msg.oleane.net ESMTP Orange Business Services (MX); Thu, 10 Jul 2008 12:22:44 +0200
Thu 2008-07-10 12:22:44: [8761:1] --> EHLO [84.0.0.0]
Thu 2008-07-10 12:22:44: [8761:1] <-- 250-smtp39.msg.oleane.net Hello 0.Red-84-0-0.staticIP.rima-tde.net [84.0.0.0], pleased to meet you
Thu 2008-07-10 12:22:44: [8761:1] <-- 250 ENHANCEDSTATUSCODES
Thu 2008-07-10 12:22:44: [8761:1] --> MAIL From:<correoA@dominioA.es>
Thu 2008-07-10 12:22:44: [8761:1] <-- 550 5.7.1 Access denied
--- End Transcript ---


Al enviar un email a una direccion me devuelve esto el servidor remoto 5.7.1 acceso denegado sabeis por que puede ser?


Gracias.

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