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Smart Network Data Services - Outlook. com Deliverability to Outlook com is based on your reputation The Outlook com Smart Network Data Services (SNDS) gives you the data you need to understand and improve your reputation at Outlook com
SNDS - FAQ - sendersupport. olc. protection. outlook. com It is against Outlook com policy to send mail from a machine which is an open proxy server, and it will be blocked from accessing some or all of Outlook com servers as long as it remains in that state