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How To: Prevent email spoofing with email authentication
The new authentication and encryption settings allow IT departments to have much greater control over the email tool. The settings in themselves are a big step towards preventing spoofing, but there is one step that must still be done on the SMTP server itself.
Product - Alteryx Designer
Additional Tools - SMTP Server
Ensure that you and your Alteryx users are on version 2019.3 or later
Enable the setting in your SMTP server equivalent to: Authentication credentials must match those of the email sender