Automating Notifications in SharePoint: Sending Emails Based on List Field Data

As a senior developer, I often encounter scenarios where we need to bridge the gap between complex data structures (like SharePoint lists) and external communication systems (like email). The request you've posed—sending an email to multiple users listed in a "Person or Group" field whenever an item is modified—is a classic synchronization challenge within the Microsoft ecosystem. While SharePoint Designer workflows are powerful, modern approaches often provide cleaner solutions.

This post will walk you through the best ways to achieve this goal, focusing on practical implementation and developer-centric best practices.

The Challenge: Iterating Over "Person or Group" Fields

The core difficulty you face lies in how SharePoint handles multi-value fields like "Person or Group." When you trigger a workflow based on a list item modification, the system needs to know not just that a change occurred, but which specific users need to be targeted. Directly setting an email recipient field in a standard workflow action often fails because it expects a single user ID, not an array of potential recipients.

We need a mechanism to iterate through every entry in that "Alert" field and execute the email action for each one individually.

Solution 1: Implementing via SharePoint Designer Workflows (The Traditional Approach)

While modern tools like Power Automate (Flow) are often preferred today, understanding the mechanics of SharePoint Designer workflows remains crucial, especially when dealing with legacy systems or complex internal processes.

To solve this without heavy coding, you must use a Loop structure within your workflow. The key is to access the list of related items dynamically.

Workflow Steps Overview:

1. Trigger: When an item is modified (or created) in the Issues list.
2. Action: Get the items from the "Alert" field. This step usually involves using a "Get items" action or similar logic that retrieves the values associated with the Person field.
3. Loop: Implement a loop structure to iterate over the collection of users retrieved in Step 2.
4. Action within Loop: Inside the loop, execute the "Send an email" action, dynamically populating the "To" field with the current user object from the iteration.

Since SharePoint Designer workflows operate primarily on structured steps and don't natively handle complex array iteration as smoothly as modern flow tools, developers often need to leverage specific scripting or newer connectors. If you are working within a mature environment, understanding how data flows is similar to architecting services in frameworks like Laravel, where managing relationships (Eloquent models) dictates how data is accessed and manipulated.

Solution 2: The Modern, Recommended Approach (Power Automate/Flow)

For this specific requirement, I strongly recommend migrating the logic to Power Automate (Flow). Flow is designed specifically for these types of cross-application, event-driven tasks, and it handles complex data structures like Person fields much more intuitively than traditional SharePoint Designer workflows.

Power Automate Implementation Steps:

1. Trigger: Select the trigger "When an item is modified" in your SharePoint site.
2. Action 1: Get Items: Use the dynamic content from the triggered item to pull the actual list of users from the "Alert" field. This action is designed to handle the array structure inherent in Person fields.
3. Action 2: Apply to Each (Loop): Introduce an "Apply to each" control, feeding it the output from the previous step (the list of users).
4. Action 3: Send Email: Inside the loop, use the "Send an email (V2)" action. Critically, populate the "To" field using the dynamic content provided by the current iteration of the loop. This ensures that for every user found in the "Alert" field, a separate email is dispatched.

This approach is significantly more robust because it natively handles the looping and data mapping required to handle multi-select fields correctly. It abstracts away the low-level scripting details, allowing you to focus on the business logic—a principle similar to how we design clean API endpoints in modern backend development, ensuring that the input translates directly into the desired output.

Conclusion

While attempting to force a complex iteration solely within SharePoint Designer can lead to fragile workflows, the goal remains achievable. For sending dynamic emails based on list data, Power Automate provides the cleanest, most maintainable, and least code-intensive solution. It allows you to leverage the power of event-driven automation without getting bogged down in complex scripting, ensuring that your notifications are reliable and scalable.