Send & Receive Issues

How to Fix Microsoft Emails Blocked by Hostinger Spam Filter

WPS Content Manager Oct 10, 2026 869 views

Question details

Users are unable to receive automated emails from Microsoft because the hosting provider's spam filter is blocking the sender.

How to Fix Microsoft Emails Blocked by Hostinger Spam Filter

Product: Microsoft Email Services
Device & OS: not provided
Scenario: Receiving essential system or automated emails from Microsoft via a Hostinger-hosted email account.
Observed behavior: Emails from azure-noreply@microsoft.com are blocked by Hostinger because hostkarma.junkemailfilter.com incorrectly classifies the Microsoft domain or IP address as a spam risk.

Before you start

Ensure you have administrator access to your Microsoft 365 portal and have a copy of the bounce-back notification or error message mentioning hostkarma.junkemailfilter.com.

Solution 1Recommended

Contact Microsoft Online Technical Support

Because the Microsoft Community cannot access the server backend or directly remove a blocklist entry, the issue must be escalated to Microsoft Technical Support to clear the false positive.

Spam filters like hostkarma.junkemailfilter.com rely on global reputation scores. If a Microsoft IP address has been temporarily compromised or flagged, Microsoft must request the delisting directly.

Log in to the Admin Center

Navigate to the Microsoft 365 admin center and sign in using your administrator credentials.

Create a New Service Request

Click on 'Support' in the left-hand menu, then select 'New service request' to open a ticket.

Provide Blocklist Details

In the request description, explicitly include the blocked sender address (azure-noreply@microsoft.com) and the notification message from hostkarma.junkemailfilter.com.

Reference Existing Tickets

If you already have a related service request number for this false-positive classification, include it in your submission to expedite the investigation process.

Contact Microsoft Online Technical Support

Backend Access Required: Only Microsoft's technical team has the authority to investigate mail-server reputation issues and request IP delistings from third-party spam monitors.

Solution 2

Whitelist the Microsoft Domain in Hostinger

You can manually add Microsoft's sending domains to your trusted allowlist within Hostinger to bypass restrictive spam rules.

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Frequently Asked Questions

Why is hostkarma.junkemailfilter.com blocking essential Microsoft emails?

This occurs when the third-party spam filter detects unusual traffic or previously flagged behavior originating from a specific Microsoft IP address. It often results in a false-positive classification that blocks legitimate automated emails like those from azure-noreply@microsoft.com.

Can the Microsoft Community forums resolve this IP blocklist issue?

No. Members of the Microsoft Community do not have access to backend servers. Resolving server reputation and IP blocklist issues requires formal investigation by Microsoft Online Technical Support.

Where can I find my Microsoft service request number?

Once you submit a ticket through the Microsoft 365 admin center, a unique service request number is generated automatically. It will be displayed in the support portal and sent directly to your designated alternate contact email address.

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