Hi Bob,
Workflows: mail sent in background. Item is created/updated etc. workflow executed without showing any message to user
Custom Action: executed directly by customer - e.g. from button in ribbon or on submit button etc.
If you are implementing some business process as part of a Workflow or Custom action, then usually email actions can be part of same workflow or custom action.
Hi Bob,
Workflows: mail sent in background. Item is created/updated etc. workflow executed without showing any message to user
Custom Action: executed directly by customer - e.g. from button in ribbon or on submit button etc.
If you are implementing some business process as part of a Workflow or Custom action, then usually email actions can be part of same workflow or custom action.