Microsoft may adjust your connection and throughput based on your sending reputation.Send no more than 50 messages per connection. Do not open more than 500 simultaneous connections to Microsoft email servers.Ensure your IP address ( IPv4 or IPv6) has a valid, non-generic rDNS (PTR) record.Do not send email from a dynamic IP address.Make sure all email sent from your servers is authorized. Do not send email through an open relay or open proxy server.Follow all Internet and SMTP standards.Set proper expectations about the content and frequency of your email. Email addresses in the safe sender's list bypasses the SmartScreen filter and is delivered to the inbox. Encourage recipients to add your sending address to their safe senders list.SRD junk votes are weighted heavily in Microsoft's filter decisions. Validity Certified senders should monitor Sender Reputation Data (SRD) in Everest.Sign up with Microsoft’s Smart Network Data Services (SNDS) to help troubleshoot delivery and sending reputation problems.High complaint rates harm your sending reputation and can result in more messages marked as spam.Sign up with Microsoft’s Junk Mail Reporting Program (JMRP) and immediately suppress all complainers from receiving future emails.Microsoft Smart Network Data Services (SNDS).Microsoft Junk Mail Reporting Program (JMRP).Microsoft recommends following their best practice guidelines to help avoid deliverability issues. The following is a summary of best practices for sending email to Microsoft users.
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