Workaround:

Right click on the From header at top of emails. Then Field Chooser

Then New, change the Type to Formula, give the new field a name (e.g. MyFrom). Enter [From] in the Formula box.

Click OK.  Now click and drag the newly created Field from the list onto the emails beside the existing From field

Now, click and drag the original From field off the email list.  The EXTERNAL Label is tied to that field, and by removing the 'real' From field it will take away the label.

Top answer
1 of 5
99

Workaround:

Right click on the From header at top of emails. Then Field Chooser

Then New, change the Type to Formula, give the new field a name (e.g. MyFrom). Enter [From] in the Formula box.

Click OK.  Now click and drag the newly created Field from the list onto the emails beside the existing From field

Now, click and drag the original From field off the email list.  The EXTERNAL Label is tied to that field, and by removing the 'real' From field it will take away the label.

2 of 5
3

Dear StevenS26,

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

Based on your description, I understand that you have a concern with "Outlook External Email Tag". Before we proceed, we need more detailed information about the situation you are experiencing.

Please help us in isolating the issue by considering the following information:

  1. Is the customer receiving the Tag when using the Outlook on the web as well?
  2. Have you checked to see if there is no transport rule to add a [External] tag in the subject line?
  3. Have you tried disabling the External Tag using PowerShell? External tagging is disabled by default, however you may connect to Exchange online PowerShell and run the command "Set-ExternalInOutlook –Enabled $false"

Basically, External email warning/Tag is a good feature, it helps to alert users from clicking malicious links, phishing emails sent by external senders. See What is the External label on Outlook mobile email? (microsoft.com)

In addition, External tagging is a new feature, if some users are not getting this Tag in theirs Outlook client, they might be using older versions of Outlook.

We look forward to hearing from you; Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution. Thank you for your cooperation.

Sincerely,

De Paul | Microsoft Community Moderator

🌐
Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4708803 › how-to-add-external-e-mail-account-to-new-outlook
How to add external E.-Mail account to New Outlook? - Microsoft Q&A
As mentioned in the article: There are many different types of email accounts you can add to Outlook, including an Outlook.com or Hotmail.com account, the work or school account you use with Microsoft 365, Gmail, Yahoo, iCloud, and Exchange accounts.
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 4646058 › external-box-on-all-e-mails-in-outlook-m365
"External" box on all e-mails in Outlook M365 - Microsoft Q&A
You can vote on whether it's helpful, but you can't add comments or replies or follow the question. ... No, there is no option to do that in the New Outlook. However, the External tag has switched from in front of the From field to behind the From in recent builds of Classic Outlook.
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ExtendOffice
extendoffice.com › documents › outlook › how to filter external emails automatically in outlook?
How to filter external emails automatically in Outlook?
... (3) In the Search Text dialog box, enter "@" in the first box, click the "Add" button, and then click the "OK" button. ... (3) In the Rules and Alerts dialog box, select the folder that you will move external emails to, and then click the "OK" button. ... (3) In the Search Text, enter ...
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Reddit
reddit.com › r/office365 › now you can mark your external emails easily with outlook's new configuration
r/Office365 on Reddit: Now you can mark your external emails easily with Outlook's new configuration
September 20, 2019 -

Microsoft has introduced a new 'External' tag to provide a native experience to identify external emails. This native method overcomes the disadvantages of the existing Transport rule configuration method.

https://o365reports.com/2021/04/27/enable-external-email-warning-tag-in-exchange-online/

Start enabling this most-awaited feature for your organization too.

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Shoviv
shoviv.com › shoviv blog › outlook › how to manage outlook external email warning in office 365?
How to Manage Outlook External Email Warning in Office 365?
September 25, 2025 - Then, create the rule to add an external warning with the help of the below command. New-TransportRule -Name "External Email Warning" -FromScope NotInOrganization -PrependSubject "[External]" Thereafter, test the email warning by sending an email from an external sender. Users can use these methods to enable Outlook email warnings on the Office 365 cloud-based platform.
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Greenloopsolutions
greenloopsolutions.com › home › faq: “external” tag and mail-tip in office 365
FAQ: "External" tag and mail-tip in Office 365 - GreenLoop IT Solutions
May 29, 2024 - Messages received from any domain except those registered for your Office 365 organization are marked by Exchange Online as [External] when they pass through the transport service on their way to user mailboxes.
Find elsewhere
Top answer
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1

Thank you for this information. Unfortunately, when I get to step 8 (click the save and close button), I get an error message that says I do not have permission to save, as below.

Here's my problem. I am the global administrator for the tenant. I am an owner of the distribution group. I am a member of the distribution group. For the life of me, I cannot find a setting anywhere in Exchange admin (or in 365 admin, for that matter). Thus, if you can point me to the place where I need to fiddle with permissions settings, I would be grateful.

Thank you for your help.

Dear StrongEagle111,

 

Good day!

Thank you for posting to Microsoft Community. We are happy to help you. To add external email addresses to a distribution list in Outlook, the church secretary can follow these steps:

  1. Open Outlook and click on the Address Book icon in the Home tab.
  2. In the Address Book window, select the Global Address List from the dropdown menu.
  3. Search for the distribution list called Church Members and double-click on it to open it.
  4. Click on the Modify Members button in the toolbar.
  5. In the Modify Members window, click on the Add button.
  6. In the Add Members window, enter the email addresses of the church members in the Email field, and their names in the Name field.
  7. Click on the OK button to add the members to the distribution list.
  8. Click on the Save and Close button to save the changes.

Note that the church secretary will need to have permission to modify the distribution list in order to add members to it. If they do not have permission, they will need to contact the Exchange 365 admin to grant them the necessary permissions.

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Dear StrongEagle111,

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

Based on your description, I understand that you have a query "How Can Outlook User Add External Emails to a Microsoft 365 Distribution List?" At this very moment, I am looking into whether there could be a possible solution to this issue. I will get back to you as soon as I get any additional information about your query.

Your patience and cooperation are much appreciated.

🌐
Reddit
reddit.com › r/outlook › sending outlook.com through external email?
r/Outlook on Reddit: Sending outlook.com through external email?
July 21, 2021 -

I like Outlook.com to manage my personal email, but have a third-party ISP as a mail server so that I can have custom email addresses under my URL. In terms of receiving emails, that's not a problem as the third-party server is set to forward any emails to my Outlook address.I had Outlook.com set up to send my emails through my third party server, so my "From" address matched what they sent to. A little over a month ago, I had to change my ISP passwords, and since, I get a "cannot send" error message when I use the default email address (my personal URL)... I need to send from my legacy @live.com email address for the email to get through.So, looking into it... it seems Outlook.com stopped new accounts from adding 3rd party server sending, but "kept" legacy accounts... but I think once I changed passwords, it can no longer do that, and there don't be any setting I can find to update the info....So, am I just out of luck? It looks like I may still be able to add my personal email to the Outlook program on my devices (but I have 2 different work accounts on there, and would prefer some separation if possible), but is my using Outlook.com to send emails under my personal URL officially done?

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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 1381754 › external-mail-accounts-to-outlook-web
External Mail Accounts to Outlook WEB - Microsoft Q&A
If the problem is successfully solved, you can share your solution or accept the helpful reply as answer, this will make answer searching in the forum easier and be beneficial to other community members as well. Similarly, this action encourages more users to provide quality responses. ... As far as I know, only Exchange online’s user mailboxes and Microsoft email accounts can log in to Outlook on web. For recipient types such as mail users, guest mail users, mail contacts, etc., they receive messages and deliver them to external email addresses.
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Microsoft Support
support.microsoft.com › en-us › office › add-your-other-email-accounts-to-outlook-com-c5224df4-5885-4e79-91ba-523aa743f0ba
Connected email accounts like Gmail and Yahoo not working in ...
Forward email from your other account to an existing account in Outlook.com ​​​​​​​If you still want to access your email in Outlook.com, you can forward mail from your third-party account.
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Mail.com
support.mail.com › premium › imap › outlook.html
Setting Up Outlook
To synchronize your emails with IMAP or POP3 you need to activate this feature in your mail.com account. Click Email → Settings → POP3 & IMAP → Enable access to this account via POP3 and IMAP. Confirm the altered settings by clicking Save and start your external email program.
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JustAnswer
justanswer.com › microsoft-office › qhghg-can-t-send-receive-external-emails-outlook.html
Fix Outlook: Can't Send/Receive External Emails | FAQ
Question has been completed. ... Outlook users often face email delivery failures and issues sending to distribution groups. Email delivery failures in Outlook business accounts often stem from misconfigured recipient groups or incorrect SMTP settings. Verify that distribution groups are properly set up in the Exchange Admin Center and that external senders have permission to email these groups.
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Reddit
reddit.com › r/microsoft365 › external mail server - using outlook/windows mail
r/microsoft365 on Reddit: External Mail Server - Using Outlook/Windows Mail
March 8, 2025 -

Hi there!

We are using an external domain & mail provider for a couple of years now and we recently signed up to MS 365 Business Standard.

I've added our domain (without DNS entries) so that all tenants can use their company email address to log in to onedrive, office and so on.

We want to keep using our existing mail server!

After logging into Microsoft Outlook... i am no longer able to receive/send mails using my company email address. Its also no longer possible to change imap/smtp settings for said email address.

How do i solve this problem?

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Microsoft
support.office.com › en-us › article › add-your-other-email-accounts-to-outlook-com-c5224df4-5885-4e79-91ba-523aa743f0ba
Outlook.com
Forward email from your other account to an existing account in Outlook.com ​​​​​​​If you still want to access your email in Outlook.com, you can forward mail from your third-party account.
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ALI TAJRAN
alitajran.com › home › add tag to external emails in microsoft 365 for extra security
Add tag to external emails in Microsoft 365 for extra security - ALI TAJRAN
May 8, 2024 - Note: After you enable the cmdlet, it can take between 24-48 hours before the users see the external tag from received external emails. Don’t you want to add an external tag to a domain or multiple domains? Add the domains to the allow list. Set-ExternalInOutlook -AllowList @{Add="contoso.com", "microsoft.com"}