Hotmail 550 SC-001 error

Hi peeps. I've recently started receiving errors when sending emails to hotmail accounts, they are being bounced with the following error: "SC-001 Mail rejected by Windows Live Hotmail" It appears, at least in my tests, that Hotmail doesn't like receiving emails from smtp servers that are different to the senders email address/domain. In other words if the senders domain is ge3k.co.uk but the email is ...more»