i set a SMTP RELAY in office 365 and i found if i use the SMTP RELAY to send email, my send ip will be 104.47.124.xxx - 104.47.126.xxx. all of the ip are office365 ip but most of these ip is in block list. ---------------one part of the error message--------------- Remote Server returned '550 5.0.350 Remote server returned an error -> 550 SC-001 (BAY004-MC6F36) Unfortunately, messages from 104.47.126.210 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 .'
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