Dealing with blocked emails in Hotmail (now Outlook.com) is a common frustration, whether you are missing important messages or trying to stop an influx of spam. Why Are Your Hotmail Emails Blocked?
| Error Code | Meaning | |------------|---------| | 550 5.7.1 | General block – sender reputation poor | | 550 5.7.1 Service unavailable | IP or domain on Microsoft blocklist | | 550 5.7.1 Authentication required | SPF/DKIM failure | | 550 5.7.1 High probability of spam | Content or behavior triggers |
Microsoft requires valid authentication. Failure here guarantees a block. blocked emails hotmail
This article explains why Hotmail blocks emails, how to diagnose the exact issue, and step-by-step solutions to ensure your messages reach the inbox.
Microsoft uses aggressive filtering to protect users, but legitimate mail often gets caught in the crossfire. Common reasons include: Dealing with blocked emails in Hotmail (now Outlook
If you have corrected the technical issues (SPF/DKIM) and reduced complaint rates, submit a delisting request.
Before requesting removal from a blocklist, the sender must ensure technical compliance. Failure here guarantees a block
Review your recent sending practices.