Microsoft is more likely to deliver your email to your subscribers' inboxes if they see a low rate of users marking your email as spam or phishing. Poor sending reputation: Your sending reputation is a direct reflection of your commitment to following sending best practices.The SmartScreen® filter is influenced by a number of factors related to the sender, including the sending IP address, domain, authentication, list quality, complaint rates, content and engagement. Exchange Online Protection® has more of a focus on IP and domain reputation, authentication and spammer infrastructure, and less of a focus on content filtering. Microsoft uses their proprietary Exchange Online Protection® and SmartScreen® spam filter to help protect their users from spam. View the Microsoft message headers for any campaign sent to Everest by navigating to In-Flight>Inbox Placement, clicking the campaign subject line on a recent test, clicking the Hotmail details arrow button on the right, and clicking the Headers arrow button for any seed address. Microsoft provides some guidance related to the email message headers that can help you troubleshoot possible causes of delivery issues. Microsoft Header Analyzer (Message Analyzer tab).Microsoft's Bulk Sender Policies and Guidelines.If you are being blocked, be sure to include a copy of the entire error message as it will help Microsoft troubleshoot the issue and may help towards a faster resolution. Prior to opening a support ticket, do your best to troubleshoot and fix the cause and refrain from opening multiple tickets for the same issue or IP address. When troubleshooting blocks at Microsoft, you can open a support ticket directly with Microsoft to help determine a cause. Microsoft troubleshooting tools and support Always follow Microsoft's bulk sender policies and guidelines to help improve your chances to make it to the inbox. This article provides troubleshooting information for senders having trouble getting email delivered to users' inboxes.

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