Or, How to create
email transport rule in Office365 server?
Descriptions: First
thing first, there is no option in mailbox properties to restrict a specific
user from sending email outside the organization if you are using Office365
online exchange server. This is one of worst limitation of Office365 server and
mailboxes along with too many others. Yeah, there is way to achieve this
requirement still.
To block the external emails for a specific user, you can
create a transport rule. Be extra careful while creating this transport rule as
it can impact more than you expect if created wrongly.
If you are not much
familiar with creating transport rules, my advice is to get in touch with MS
Support guys and get it done in their supervision.
Steps:
Login to your Office 365 account.
Under Admin console choose Exchange.
Under Exchange admin centre (EAC), go to mail flow > rules
Click on the +
sign > create a new rule
You can use any
friendly and logical name for this rule > Click on ‘more options’ to
see advanced options > carefully select the user and condition > Click on
Save
Good Luck..