¿El motivo?
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Final-Recipient: RFC822; xxxx@hotmail.com
Action: failed
Status: 5.0.0
Diagnostic-Code: SMTP; 550 SC-001 (COL004-MC4F39) Unfortunately, messages from xxxxxx weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
Action: failed
Status: 5.0.0
Diagnostic-Code: SMTP; 550 SC-001 (COL004-MC4F39) Unfortunately, messages from xxxxxx weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
Falso positivo por spam.
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Blocked due to user complaints or other evidence of spamming
Ahora los mensajes llegan, pero van directamente a la carpeta de "Correo no deseado"
Por lo visto Microsoft no tiene bastante con los registros SPF y una reputación intachable.
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Authentication-Results: hotmail.com; spf=pass (sender IP is XXXX) smtp.mailfrom=foro@elhacker.net; dkim=none header.d=elhacker.net; x-hmca=pass header.id=foro@elhacker.net