10 Useful Mailbox Management Scripts for Microsoft 365 Admins

Managing mailboxes across a Microsoft 365 environment can become complex, especially as your organization grows. Fortunately, PowerShell scripting with Microsoft Graph allows admins to take full control over mailbox tasks like monitoring activity, archiving old emails, sending automated messages, and cleaning up unwanted content.

In this guide, we’ve compiled 10 essential mailbox management scripts that every Microsoft 365 administrator should know—each with a direct link to a step-by-step M365Corner tutorial.

Why Use PowerShell Scripting for Microsoft 365 Mailbox Management?

Here are a few reasons why PowerShell is ideal for mailbox management:

• 🚀 Automation: Perform tasks at scale without manual steps.
• 🔍 Visibility: Monitor mailbox usage, flagged emails, and storage trends.
• 🛠️ Customization: Tailor scripts to organizational policies and user needs.
• 🧹 Cleanup: Remove clutter, old emails, and sensitive content automatically.
• 🔄 Consistency: Apply the same logic across all user mailboxes.

Whether you're maintaining mailbox hygiene, enforcing compliance, or supporting your helpdesk team, scripting makes it faster and easier.

10 Useful Microsoft 365 Mailbox Management Scripts for Admins

Here’s a curated list of powerful scripts to help you manage mailbox tasks with precision:

• Monitor Emails in the Last 30 Days Using Graph PowerShell

Use this script to analyze email volume trends over the past 30 days for any user mailbox. Great for usage reports and detecting anomalies.

👉Monitor email activity for the last 30 days

• Retrieving Unread Emails with Graph PowerShell

Need to check a user’s unread emails? This script helps you find all unread messages—useful for follow-ups or identifying neglected inboxes.

👉Retrieve unread emails from user mailbox

• Automate Email Archiving with Graph PowerShell

Automatically move older emails to archive folders based on custom criteria like date, subject, or importance—perfect for mailbox cleanup.

👉Automate email archiving in Microsoft 365

• Delete Emails from M365 Mailboxes with Graph PowerShell

Use this script to delete emails in bulk based on filters like subject, sender, or date. A handy way to remove spam or outdated alerts.

👉 Delete filtered emails from mailboxes

• Send Automated Emails to Users with Graph PowerShell

Need to notify users programmatically? This script sends custom emails automatically, ideal for alerts, onboarding, or reminders.

👉Send automated emails to Microsoft 365 users

• Identify M365 Emails with Attachments Using Graph PowerShell

This script scans mailboxes to find emails with file attachments, which is useful for auditing, storage monitoring, or identifying large messages.

👉 Find emails with attachments in user mailbox

• Retrieve M365 User Flagged Emails Using Graph PowerShell

Easily retrieve flagged emails (follow-up tasks) from a user’s mailbox. Useful when tracking pending actions or reviewing productivity signals.

👉 Get flagged emails from Microsoft 365 users

• Get M365 Emails from Specific Sender with Graph PowerShell

This script allows you to filter emails from a particular sender—great for audits, HR reviews, or locating specific communications.

👉 Fetch emails from a specific sender

• Get Important Emails from User Mailbox Using Graph PowerShell

Easily find emails marked as Important in the user’s mailbox. This can help identify critical communication or missed high-priority messages.

👉 Identify important emails in mailbox

• Permanently Delete Emails from Deleted Items Folder

This script permanently clears the Deleted Items folder so that emails are not recoverable—ideal for security or retention policies.

👉 Permanently delete emails from Deleted Items

Final Thoughts

With the help of these scripts, Microsoft 365 administrators can streamline mailbox operations, stay compliant, and maintain healthy mail environments without relying on manual intervention.

Bookmark this page for quick access to your go-to mailbox automation scripts and start simplifying your admin life today!