said: 550 SC-001 (COL004-MC5F3) Unfortunately, messages from xxx.xx.xxx.xx 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. (in reply to MAIL FROM command)
Second question is to ask for suggestions on alternative email services I might use to send out forum emails, is there anything that's more Hotmail friendly?
Anything else worth trying?
I know this happens a lot, but it's so sudden after no problems, so wondering if anyone else is affected?