Tip: Other languages are Google-Translated. You can visit the English version of this link.
Log in


How to get warning when sending email to external domain in Outlook?

While using Outlook, how can you prevent sending emails accidentally to recipients outside your company? Actually, you can display warning box when sending email to external domain in Outlook. This article will introduce a VBA method to achieve it.

Get warning when sending email to external domain with VBA code

Get warning when sending email to external domain with VBA code

The following VBA code can help you get warning when sending email to external domain in Outlook. Please do as follows.

1. Press the Alt + F11 keys to open the Microsoft Visual Basic for Applications window.

2. In the Microsoft Visual Basic for Applications window, double click ThisOutlookSession to open the ThisOutlookSession (Code) window, and then copy below VBA code into the window. See screenshot:

VBA code: Get warning when sending email to external domain

Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
'Update by Extendoffice 20180504
Dim xMailItem As Outlook.MailItem
Dim xRecipients As Outlook.Recipients
Dim i As Long
Dim xRecipientAddress As String
Dim xPrompt As String
Dim xYesNo As Integer
Dim xPos As Integer
On Error Resume Next
If Item.Class <> olMail Then Exit Sub
Set xMailItem = Item
Set xRecipients = xMailItem.Recipients
For i = xRecipients.Count To 1 Step -1
    xRecipientAddress = xRecipients.Item(i).Address
    xPos = InStrRev(LCase(xRecipientAddress), "@addin99.com")
    If xPos <= 0 Then Exit For
    Cancel = False
If InStrRev(LCase(xRecipientAddress), "@addin99.com") > 0 Then Exit Sub
xPrompt = "Are you sure to send this email to outside your company? "
xYesNo = MsgBox(xPrompt, vbYesNo + vbQuestion, "Kutools for Outlook")
If xYesNo = vbNo Then Cancel = True
End Sub

Note: In the code, “@addin99.com” is the internal email domain you will send emails to. Please change it as you need.

From now on, when clicking Send button to send emails to external email domain (not the internal email domain you specified in the VBA code), a warning box will pop up as below screenshot shown.

Related articles:

Recommended Productivity Tools

Ribbon of Excel (with Kutools for Excel installed)

300+ Advanced Features Increase Your Productivity by 71%, and Help You To Stand Out From Crowd!

Would you like to complete your daily work quickly and perfectly? Kutools For Excel brings 300+ cool and powerful advanced features (Combine workbooks, sum by color, split cell contents, convert date, and so on...) for 1500+ work scenarios, helps you solve 82% Excel problems.

  •  Deal with all complicated tasks in seconds, help to enhance your work ability, get success from the fierce competition, and never worry about being fired.
  •  Save a lot of work time, leave much time for you to love and care the family and enjoy a comfortable life now.
  •  Reduce thousands of keyboard and mouse clicks every day, relieve your tired eyes and hands, and give you a healthy body.
  •  Become an Excel expert in 3 minutes, and get admiring glance from your colleagues or friends.
  •  No longer need to remember any painful formulas and VBA codes, have a relaxing and pleasant mind, give you a thrill you've never had before.
  •  Spend only $39, but worth than $4000 training of others. Being used by 110,000 elites and 300+ well-known companies.
  •  60-day unlimited free trial. 60-day money back guarantee. Free upgrade and support for 2 years. Buy once, use forever.
  •  Change the way you work now, and give you a better life immediately!

Office Tab Brings Efficient And Handy Tabs to Office (include Excel), Just Like Chrome, Firefox, And New IE

  • Increases your productivity by 50% when viewing and editing multiple documents.
  • Reduce hundreds of mouse clicks for you every day, say goodbye to mouse hand.
  • Open and create documents in new tabs of same window, rather than in new windows.
  • Help you work faster and easily stand out from the crowd! One second to switch between dozens of open documents!
Say something here...
symbols left.
You are guest ( Sign Up? )
or post as a guest, but your post won't be published automatically.
Loading comment... The comment will be refreshed after 00:00.
  • To post as a guest, your comment is unpublished.
    Magnus · 1 months ago
    Doesn't work, no pop-up is showing.
  • To post as a guest, your comment is unpublished.
    Lukas Jirovsky · 3 months ago
    I had the same problem - getting warning also for the internal e-mails.
    When the internal e-mail address from Directory is used, xRecipientAddress does not return the address, but some weird exchange string like /O=<organization...> - try to print it in MsgBox and you will see yours.
  • To post as a guest, your comment is unpublished.
    Tim · 4 months ago
    This does not work. I do not get a pop up for internal or external.
  • To post as a guest, your comment is unpublished.
    David · 4 months ago
    This is prompting both internal and external emails. both domain fields have been updated. Any thoughts? Many thanks
  • To post as a guest, your comment is unpublished.
    Yo · 6 months ago

    Gran aporte pero me lo pregunta para todos los envíos y no solo para los de una determinada dirección. Es decir, siempre me sale el mensaje independientemente del dominio... ¿está bien el código? Gracias.