Email Delivery Failure Due to IP Address Block Listing by Outlook

Email Delivery Failure Due to IP Address Block Listing by Outlook

Dear Support Team,

We are experiencing an urgent issue that is critically affecting our business operations. Our email messages from the IP address [103.163.153.3] are not being delivered, as they are being blocked with the error code 5.7.1. This block listing by Outlook is preventing essential communications and hindering our ability to function effectively. We kindly request your immediate assistance in resolving this matter to restore our email functionality. Your prompt attention to this emergency is greatly appreciated.

```
5.7.1 Unfortunately, messages from [103.163.153.3] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [AMS0EPF000001A2.eurprd05.prod.outlook.com 2024-07-03T01:47:47.244Z 08DC9872D7722763]
```


Thank you for your support.

    • Sticky Posts

    • Zoho Mail POP & IMAP Server Details

      Hello all! We have been receiving a number of requests regarding the errors while configuring or using Zoho Mail account in POP/ IMAP clients. The server details vary based on your account type and the Datacenter in which your account is setup. Ensure

    • Important update on Group Management | Zoho Mail

      Dear Zoho Mail Community, This post is to inform you all of the following updates on the Group Management in Zoho Mail. Group Member Addition: If a group member is added to an organization group in a Zoho Application, the member will be automatically

    • Mastering email etiquette and best practices to follow in Zoho Mail

      Hello Zoho Mail Community, We’re thrilled to invite you all to our upcoming webinar: Mastering email etiquette and best practices to follow in Zoho Mail. Join our live webinar for expert etiquette tips to enhance your professionalism and elevate your

    • 📣 📣 ZUG Meetups India - Explore Hybrid Workspaces using Zoho Workplace - Meet and Learn! 🧑🏽‍💻🧑🏽‍💻

      We are excited to announce the User Community initiative to meet you all in person and help you explore the need of the hour - Hybrid Workspaces using Zoho Workplace. We aim to help you to setup your Digital Workplace effectively so that your employees

    • Announcing Zoho Mail - Inactive user Policy

      Dear Zoho Mail users, Thanks to all of you for your continuous support.  We have recently started implementing the Inactive User Policy, for Zoho Mail.  A user is considered as inactive, if the user has not logged in to the Zoho mail account for a period of more than 120 days. The login through POP, IMAP and Active Sync are all taken into account for tracking the period of inactivity.  Whoever received the communication need not panic, as we have just communicated our policy to all the users.  To