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How to disable external email Nintex O365

Question asked by pwilliamson1991 on Oct 9, 2018

The company requires all external email to go through our own internal email filtering system. When configuring an email action I can select "External email and attachment" which uses an external email service configured by Nintex. I need to prevent users sending email externally either by preventing the selection of this option or by having our domain  restricted to prevent the external email service. I have tested this and currently our domain is prevented from sending email attachments (which is good). How can I prevent external email?