For users having Gmail as email service can find details here. The details here are subject to change by Google as per their discretion.
For users having Outlook and any other email service, can contact system administrator of their respective organization.
To apply SMTP settings go to Admin Panel >> Tools >> Integration >> SMTP Settings

Another option to apply SMTP setting is through Execution Wizard. Make sure that you have checked Show Advanced Settings option to show Advanced Execution Settings page having SMTP Settings.

Important Points you need to know for SMTP Configrations:
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