warn if a message is being sent to an external recipient for outlook & other mail clients

How can you get Outlook & other mobile devices mail clients to warn you if you are about to send an email to an external domain?

September 11th, 2015 3:35am

Hi,

You can use Exchange transport rules for this. Log into the Exchange Control Panel > mail flow > rules > add. 

Set up your rule as below to notify users in Outlook before sending. 

As for warning mobile devices perhaps you'll need to look at a different mail client as they won't support mail tips. You could set up the rule to block the messages with a custom NDR but other than that I don't know of a way to do this for mobile devices using native Exchange tools. Perhaps one of the mobile device management technologies will assist e.g. Airwatch or MobileIron.

T

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September 11th, 2015 6:10am

This forum is for Exchange development questions. Your question is more of an Exchange admin question, and would be better served in the admin forums on TechNet. I'll move this for you.
September 11th, 2015 9:33am

Hi , 

You can make use of the mail tips to intimate the exchange users whey they try to send an email to the external recipients .But known to my knowledge it supports outlook 2010 ,later outlook versions and owa .

https://technet.microsoft.com/en-us/library/jj649091(v=exchg.150).aspx

On the above mentioned link please check the mail tips functionality for external recipients .

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September 11th, 2015 9:55am

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