Sep 23, 2021 | Email Conversion

Top 2 Methods to Increase Emails Size Limit in Office 365

By Deepak Singh Bisht


A lot of users ask questions regarding low mail size limits, such as how to increase Office 365 email size, how to increase Outlook 365 attachment limit, what is Outlook 365 max attachment size, etc.

In this post, we will discuss Office 365 email size. We will also learn methods to increase mail attachment size in Office 365. If you are an Office 365 user and want to increase your email size limit, then this post will be helpful for you.

What is the default maximum message size in Office 365?

For the past few years, the maximum email message sending or receiving limit in Office 365 was 25 MB. Due to which many users had to face a lot of problems. Recently Microsoft has increased the email size limit from 25 MB to 150 MB. It gives Office 365 administrators the ability to set the maximum message size from 1MB to 150MB.

However, the default maximum message size is still 25 MB because many users are happy with this. If you want to increase mail attachment size in office 365, you can set default message size restrictions.

What is the maximum office 365 attachment limit?

Email is not only used for sending a text message. You can also send documents or files using email. Whenever a user sends large documents, Outlook shows them a failure message. To solve this issue, Microsoft has increased the email size limit from 25 MB to 150 MB. So Office 365 doesn't have an attachment limit.

Message size limit - Outlook: 150MB

File attachments limit: 250 attachments

File attachment size limit 150MB

Method 1: Increase office 365 email size limit using the Exchange Admin Center

In this method, we will use the Exchange Online admin center to increase the email size limit in Outlook 365.

1. Sign in to your Office 365 Account

2. Click on Admin centers and select the Exchange

exchange admin center screen

3. From the Exchange admin center, select recipients and click on Mailboxes.

admin mailboxes option

4. Click on the … icon and select the Set default message size restrictions.

default message size restrictions option

5. From the default message size restrictions popup, set Maximum size for sent message and received message and Click on OK.

email size setup screen

Increase email size limit for multiple users using the Bulk Edit

If you want to increase the email size limit for multiple mailboxes, follow the steps below.

1. Sign in to your Office 365 Account

2. Click on Admin centers and select Exchange

exchange admin center screen

3. From the Exchange admin center, select recipients and click on Mailboxes.

admin mailboxes option

4. Select All Mailbox, under the Bulk Edit, select message Size Restrictions and click on update.

bulk export option

5. From the Bulk edit message size restrictions screen, set Maximum size for sent message and maximum size for the received message and Click on the Save.

bulk email size setup screen

Method 2: Increase Office 365 size limit using PowerShell Command

If you have many users, you can use the PowerShell command to increase mail attachment size in Outlook 365. Using PowerShell, you can quickly perform this task. Mainly it is used by small and large organizations.

Phase 1: Login Office 365 account by using PowerShell

$Cred=Get-Credential

Type the above command and press Enter. Next, type the Office 365 username and password.

Phase 2: Once you log in, type the following command.

$Session=New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $Cred -Authentication Basic -AllowRedirection

Phase 3: Now, type the following command to import the PSSession

Import-PSSession $Session

Phase 4: You can select the below command as per your requirement.

  1. Update single mailbox

    Set-Mailbox -Identity [email protected] -MaxSendSize 100MB -MaxReceiveSize 100MB

  2. Update multiple mailboxes

    ("user1", "user2", "user3")|%{Set-Mailbox -Identity $_-MaxSendSize 100MB-MaxReceiveSize 100MB}

  3. Update all mailboxes

    Get-Mailbox | Set-Mailbox -MaxSendSize 100 MB -MaxReceiveSize 100 MB

  4. Update the default mailbox settings (For mailboxes you create in the future.)

    Get-MailboxPlan | Set-MailboxPlan -MaxSendSize 100MB -MaxReceiveSize 100MB

Frequently Asked Questions

How to check the email attachment size limit in Exchange?

To check the attachment size limit in Exchange, use the following command.

  1. Get-TransportConfig | Format-List MaxReceiveSize,MaxSendSize,MaxRecipientEnvelopeLimit
  2. Get-ReceiveConnector | Format-Table Name,Max*Size,MaxRecipientsPerMessage
  3. Get-SendConnector | Format-Table Name,MaxMessageSize

What is the maximum message size of Outlook Office 365?

Microsoft has increased the message size limit to 150MB, which means you can set the message size from 1MB to 150MB.

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