My ISP is Pipex, and I also use a domain name that forwards to my Pipex address. I've been having problems today sending an email to a friend who uses hotmail: within a minute my mail bounces back with this message :"5.1.0 - Unknown address error 550-'SC-001 Mail rejected by Windows Live Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/network admins, please visit click here for email delivery information and support". There was nothing spam-like in the content (which was about trying to arrange a date for a committee meeting), and I frequently write to this person successfully. I've tried sending by normal (OE) method and via webmail, but both have bounced. I'll try the suggestions in the bounce message, but past experience suggests it will take ages to get a response, so has anyone got any suggestions or advice, please.