Emails Hotmail !new! - Blocked

| Error Code | Common Meaning | Recommended Action | | :--- | :--- | :--- | | | Unauthenticated or blocked sender. | Check SPF/DKIM/DMARC records. | | 550 5.7.509 | IP blocked due to poor reputation. | Request delisting via sender portal. | | 421 4.7.0 | Temporary rate limiting. | Slow down sending volume; warm up IP. | | 550 5.7.511 | Domain blocked. | The sending domain is blacklisted by Microsoft. |

Emails with "spammy" characteristics, such as excessive links, broken images, or certain keywords, are often automatically diverted to the Junk Email folder. blocked emails hotmail