Connect to Office 365 using a remote PowerShell session or using the Exchange Online PowerShell v2 (EXO V2) module.įor new mailboxes, restrictions on the max size of incoming and outgoing emails are set in the plan settings: You can check current limits through the Exchange Admin Center or with PowerShell.
In Exchange Online (Microsoft 365), you can set the maximum message size limit in the settings of each mailbox individually. Get-Mailbox maxbak |ft Name, MaxSendSize, MaxReceiveSize Get-SendConnector | ft Name, MaxMessageSize Get-ReceiveConnector | ft Name, MaxSendSize Get-TransportConfig | ft MaxSendSize, MaxReceiveSize You can view the current limits using the Exchange Management Shell: In an on-premises Exchange Server, maximum email size limits are configured in several places (at the server, mailbox, and connector levels). The following table contains the maximum attachment size limits for most popular email services: Mail serviceĪttachment Size Limit in Exchange and Microsoft 365 But most public email providers don’t accept emails larger than 25 MB. If you send large emails only within your organization (local network), you can set any attachment size in Outlook.
Maximum size of appendable message has been exceeded.Error 0x80040610: The message being sent exceeds the message size established for this user.552 5.3.4 Message size exceeds the fixed maximum message size.The message was not sent reduce the message size and try again.System Undeliverable, message size exceeds outgoing message size limit.552: Message size exceeds the maximum permitted.Attachment size exceeds the allowable limit.Here are sample NDR messages you can get: This NDR will contain information that the maximum attachment size has been exceeded. If your or recipient’s email server doesn’t support large emails, you will receive an NDR (Non-delivery report) when trying to send a large email message from the Outlook or PowerShell script. Close the Registry Editor and restart Microsoft Outlook.Īfter the changes are made, you can attach larger files to your Outlook email (in our example, we have attached a 50 MB PST file).Reg add HKEY_CURRENT_USERSoftwareMicrosoftOffice16.0OutlookProfilesOutlookPreferences /v "MaximumAttachmentSize" /t REG_DWORD /d 51200 /f Reg add HKEY_CURRENT_USERSoftwareMicrosoftOffice16.0OutlookPreferences /v "MaximumAttachmentSize" /t REG_DWORD /d 51200 /f For example, to set the limit of 50 MB for Outlook in Office 365, run the command: You can set a limit on the size of Outlook attachments in the registry from the command prompt. Create the MaximumAttachmentSize registry parameter with the same value in the reg key HKEY_CURRENT_USERSoftwarePoliciesMicrosoftOffice x.If there is no MaximumAttachmentSize parameter in this registry key, create it manually: New -> DWORD (32-bit) Value.
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