We are implementing application on Appian cloud. Looking to send an email notification to the external / non-appian users using send email smart service but looks like this smart service can be used to send an email to internal / appian users only. Is there a way to send an email to external emails/users ?
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I have seen in the past that the SMTP server is blocking the emails from Appian. You may need to define a custom email server and then make sure they are not on the 'spam' list.
https://docs.appian.com/suite/help/19.3/Configuring_Custom_Email_Senders.html
Hope that helps