Waarschijnlijk herkennen jullie onderstaand probleem. Soms kun je geen mail versturen naar hotmail adressen. Je krijgt dan onderstaande melding. Als je het op internet natrekt, zie je dat er voorbeelden genoeg bekend zijn.
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<CPSMTPM-EML107.kpnxchange.com #5.5.0 smtp;550 SC-004 Mail rejected by Windows Live Hotmail for policy reasons. A block has been placed against your IP address because we have received complaints concerning mail coming from that IP address. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help.
Email/network admins, we recommend enrolling in our Junk E-Mail Reporting Program (JMRP), a free program intended to help senders remove unwanted recipients from their e-mail list: http://postmaster.live.com>