---
title: Update the Existing Rule to Allow an Additional Domain to Route Through Black Pearl Mail for M365
description: Black Pearl Mail Knowledge Base
---

[Skip to content](https://help.blackpearl.com/update-the-existing-rule-to-allow-an-additional-domain-to-route-through-black-pearl-mail-for-m365#main-content)

[Raise a Ticket](https://help.blackpearl.com/kb-tickets/new?hsLang=en)

[![logo](https://help.blackpearl.com/hs-fs/hubfs/logo.png?width=101&height=101&name=logo.png)](https://blackpearlmail.com/)

Open main navigation

Close main navigation

- [Raise a Ticket](https://help.blackpearl.com/kb-tickets/new)
- [Contact us](mailto:support@blackpearl.com)

[Contact us](mailto:support@blackpearl.com)

 How can we help you?

- There are no suggestions because the search field is empty.

1. [Black Pearl Mail Knowledge Base](https://help.blackpearl.com/?hsLang=en)
2. [Configure BPM with M365](https://help.blackpearl.com/configure-bpm-with-m365?hsLang=en)

# Update the Existing Rule to Allow an Additional Domain to Route Through Black Pearl Mail for M365

**What will you need to do?**

 

This article will allow you to specify which domains you would like like to route through Black Pearl Mail in M365.

 

 

Please note, that this article assumes you have already configured your rule to specify which domains you would like to pass through, and there is an additional domain you would like to add. If you haven't configured this rule yet, then please follow the steps in [this article first](https://help.blackpearlmail.com/portal/en/kb/articles/specify-which-domains-route-through-black-pearl-mail-for-m365) .![](https://help.blackpearl.com/hubfs/Knowledge%20Base%20Import/caution-Sep-29-2025-01-26-55-9374-AM.png)

 

If you have any issues or questions during this process, please contact [**support@blackpearlmail.com**](mailto:support@blackpearlmail.com). 

 

There are 2 steps required:

1. Step 1 - Login and go to M365 Mail Flow Settings
2. Step 2 - Edit the Existing Rule to Allow an Additional Domain to Route Through Black Pearl Mail

To make this change, you will require M365 global administrator permissions.![](https://help.blackpearl.com/hubfs/Knowledge%20Base%20Import/info-Sep-29-2025-01-26-51-5979-AM.png)

 

STEP 1 – Login and go to M365 Mail Flow Settings

1) Open/go to the M365 Exchange admin center - [https://outlook.office365.com/ecp/](https://outlook.office365.com/ecp/)

 

 

2) Select **Mail flow** from the left-hand side menu.

![](https://help-insights.blackpearlmail.com/DocsDisplay?zgId=695422953&mode=inline&blockId=3gjs9c1d2d192028f41b9981d9f5b450dbdd7)

 

 

STEP 2 – Edit the Existing Rule to Allow an Additional Domain to Route Through Black Pearl Mail

In this section, we will be editing the existing **Black Pearl Mail** rule to add an additional domain to route through Black Pearl Mail.

 

1\) Click on **Rules**. 

![](https://help-insights.blackpearlmail.com/DocsDisplay?zgId=695422953&mode=inline&blockId=3gjs90403b0985f024469b2a066e2e8a87644)

 

2) Highlight the **Black Pearl Mail** rule.

![](https://help-insights.blackpearlmail.com/DocsDisplay?zgId=695422953&mode=inline&blockId=3gjs9e8d8c925c77c491d9b290c3290be84c1)

 

3) Click on the **edit** icon.

![](https://help-insights.blackpearlmail.com/DocsDisplay?zgId=695422953&mode=inline&blockId=3gjs96591c3dacad7484f840f21c258457347)

 

4\) Under ***Apply this rule if...*** you should see ***The senders domain is...*** Click on the domain to the right of this box.

![](https://help.blackpearl.com/hubfs/Knowledge%20Base%20Import/edbsn9d4adca1fdd23455dd0fa94904af82d3ac358921b52710f7ec4d97a3ae15c72a39d3416e3ab0e7c0eb38da78ab4e923b.png)

 

 

5\) In the box, enter the new domain you would like to route through and click on the ***+*** symbol to the right of the box. Then click ***OK***.

![](https://help.blackpearl.com/hubfs/Knowledge%20Base%20Import/edbsn79d5ed370aec64f663d4ee75cd00cb03846730bdb43af265feb0ec5990b4e74745d72128d87e13e43eb563de70e20e56.png)

 

 

 

 

6\) You should now see the additional domain added to the list. Click on Save.

![](https://help.blackpearl.com/hubfs/Knowledge%20Base%20Import/edbsnc9b4fc8ad92bfa3ff1ea7f8f3d27118edc4d471f36547001e4857c7fc2f8d2b2d8606c2717fb81ff1d9fe9668d180ce7.png)

 

 

After editing the rule, we strongly advise that you send a couple of test emails from all your active domains to ensure that mail is flowing correctly. If there are any issues, please contact [support@blackpearlmail.com](mailto:support@blackpearlmail.com).

 

- [Troubleshooting](https://help.blackpearl.com/troubleshooting?hsLang=en)
- [Pearl Diver](https://help.blackpearl.com/pearl-diver?hsLang=en)
- [Insights](https://help.blackpearl.com/insights?hsLang=en)
- [General](https://help.blackpearl.com/general?hsLang=en)
- [Configure BPM with M365](https://help.blackpearl.com/configure-bpm-with-m365?hsLang=en)
- [Groups](https://help.blackpearl.com/groups?hsLang=en)
- [Dashboard](https://help.blackpearl.com/dashboard?hsLang=en)
- [Mail Server Setup](https://help.blackpearl.com/mail-server-setup?hsLang=en)
- [People](https://help.blackpearl.com/people?hsLang=en)
- [Analytics](https://help.blackpearl.com/analytics?hsLang=en)
- [Mail Flow](https://help.blackpearl.com/mail-flow?hsLang=en)
- [Configure BPM with Gmail](https://help.blackpearl.com/configure-bpm-with-gmail?hsLang=en)
- [Templates](https://help.blackpearl.com/templates?hsLang=en)
- [Admin Dashboard](https://help.blackpearl.com/admin-dashboard?hsLang=en)
- [Best Practices](https://help.blackpearl.com/best-practices?hsLang=en#main-content)

    - [DNS Settings](https://help.blackpearl.com/best-practices?hsLang=en#dns-settings)

[![BPG\_Linkedin\_Icon (1)-1](https://help.blackpearl.com/hs-fs/hubfs/BPG_Linkedin_Icon%20(1)-1.jpg?width=100&height=100&name=BPG_Linkedin_Icon%20(1)-1.jpg "BPG_Linkedin_Icon (1)-1")](https://blackpearlmail.com/)

**© 2025 Blackpearl Group Limited.**