How to Grant Permissions to Other Microsoft 365 Mailboxes?

Updated On - December 14, 2023 by Armaan | Reading Time: 5 minutes

Summary: Microsoft 365 has ended up becoming a popular email client. Users often receive a lot of emails in their mailbox in Microsoft 365. However, at times they are not able to access the same. It is in such a kind of situation that this article would be helpful to you to understand the process to grant the permissions to other Microsoft 365 Mailboxes. Here we will discuss the manual and the professional solutions to grant such permissions. This will make your work much easier.

Permissions play a very important role for you to access any emails received in Microsoft 365. At times, you might receive an email and at the same time, not have the permission to access the same. There is nothing to panic in such a situation as here we will discuss about some commonly used methods that will be able to grant the permissions to access the emails in the mailbox. But first of all, lets make ourselves conversant with the kind of permissions that we can get in relation to our emails.

Kinds of permissions

There are many types of permissions that can be authorities by the owners with respect to the documents. Here are some of these permissions explained.

  • Ability to read, manage and access the emails.
  • Ability to send and receive messages.
  • Sending emails on behalf of other user.

Methods to grant permissions

We will discuss about commonly used methods to grant permission one by one:

Grant permission using Microsoft 365 Admin Center

  1. Login to your Microsoft 365 account and click on Admin.
  2. Go to users and then click on Active Users.
  3. Click on any of the Active user and go to Edit Options under the Mailbox Permissions. Grant permission using Microsoft 365 Admin Center
  4. A new page Edit mailbox permissions will get open. Click on the Edit option which is just next to Read and Manage. step 4
  5. Click on the + Add Permissions to add the user mailboxes to whom you want to grant permission. step 5
  6. Click on Save to confirm the settings. step 6
  7. You can repeat this process for new users as well.

Permission using Exchange Admin Center

  1. Login to Microsoft 365 account.
  2. Click on Admin and then go to Admin Centers and go to Exchange. Grant Permission using Exchange Admin Center
  3. Click on Recipients and then select the mailboxes to which you want to grant permissions.
  4. Click on Edit. Click on + icon and then add the new mailboxes to the list. step 4
  5. Now, select mailbox delegation option from the left pane and then click + icon under Send As to select the user mailboxes and assign them this permission. step 5
  6. Select the user mailboxes to which you want to assign this mailbox permission, click Add and then finally click OK to add them. step 6
  7. Click on Save As to confirm the settings

Grant Permission using Powershell Commands

For using this method, you need to connect Windows Powershell to Exchange Online Powershell. Follow the steps given below for the best results.

  1. First, run the Windows PowerShell as administrator (right-click on the application icon and choose Run as administrator option).
  2. Run this command:

    $session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri “” -Credential $cred -Authentication Basic -AllowRedirection

  3. Enter the Microsoft 365 global account credentials in the opened window and click on OK.
  4. Now, run this final command to connect Exchange Online to PowerShell.
  5. Now you need to assign the permissions to the selected mailbox to execute the following cmdlets. Here are three different commands that you will have to provide for different types of permissions.
  • To assign Send As permission to a user mailbox, run this command

    Add-RecipientPermission < Identity > -AccessRights SendAs -Trustee < Identity >

  • Assign Send on Behalf permission to a user mailbox with this command

    Set-Mailbox < Identity > -GrantSendOnBehalfTo < Identity >

  • Assign Full Access permission to single user mailbox with this cmdlet.

    Add-MailboxPermission < Identity > -User < Identity > -AccessRights FullAccess -InheritanceType All.

Regain Office 365 Email backup tool: A professional solution

Regain Office 365 Email Backup tool is an easier and a more professional solution to grant permissions to access mailboxes. This tool not only helps to get a quick backup of your data in the mailbox but also at the same time helps to grant quick permissions. This helps to enhance the readability of data. Here are some of the amazing features of the tool that you must know.

Free Download100% Secure Buy NowPrice: $89


  • Helps to export data to multiple email formats such as PST, MSG, EML, MBOX, and vCard.
  • Allows users to filter the emails and organize them in a better way.
  • It comes with an easy interface which is suitable for all the users.
  • It helps to maintain the structure of the data
  • It works well with Office 365 and Windows Live Mail.
  • It is compatible with all the versions of Windows Operating System.
  • It helps to backup every information.

Steps to use the tool

  1. Install the tool on your system.
  2. Connect to the server by entering the credentials. 1
  3. View the folder list and select the required items. step 2
  4. Once you have selected the files, choose the format in which you want to get your backup. step 3
  5. Specify the path to save the folders. step 4
  6. Click on Next to create a backup and the process will begin. step 5

One can now conclude that with the help of these methods, it becomes easier to grant permissions to perform multiple operations with respect to the items of the mailbox. However, if you are still facing any issue and then the professional solution is definitely there for you to make your work much easier. The tool helps to enhance the accessibility of data by making sure that you can share your items there and then.

Frequently Asked Questions

Ques1. Why are mailbox permissions important in Microsoft 365?
Ans. Mailbox permissions in Microsoft 365 are crucial for controlling email access. Users may receive emails but lack permission to access them, making it essential to manage permissions effectively.

Ques2. What types of permissions can be granted for Microsoft 365 mailboxes?
Ans. Permissions can include the ability to read, manage, and access emails, as well as send and receive messages. Users can also be granted the authority to send emails on behalf of other users.

Ques3. How is the Regain Office 365 email backup tool better than manual methods?
Ans. Professionals developed the regain Office 365 email backup tool, and we have kept all the users’ needs at the center of the development process. We’ve embedded the tool with several user-centric features, which boosts the backup speed by ten times compared to manual methods.

Ques4. What should I do if I face issues using the Regain Office 365 email backup tool to manage my Office 365 mailboxes?
Ans. In case you face any issues or are stuck in the Office 365 backup/migration process, you can contact us on chat. We take our customer as our utmost priority and are available 24 × 7 for their help.

Author: Armaan

Hello I have been working in Regain Software for the last 6 months. I have been in the field of writing for many years and worked with many Data recovery companies. Here I am writing technical blogs, Software User Guides and manual methods for email conversion and cloud migration. Now, working on all products of our company. Thanks you

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