Save SMTP to Sent Mailbox for Exchange Online

Save SMTP to Sent Mailbox for Exchange Online

By definition of the SMTP RFC all the SMTP protocol's only task is deliver and send emails. SMTP does not save copies to a sent folder as this is something that is completely dependent on the client mail readers (Outlook, Thunderbird, etc.)

Some email providers do automatically save all emails sent through SMTP on the Sent mailbox, but for some you may have to setup and configure certain rules or execute certain commands to enable that.

For Exchange Online there is a command that can be executed to enable this. Through PowerShell execute the following

set-mailbox -MessageCopyForSMTPClientSubmissionEnabled $true

The following explains the parameter in further


This parameter is available only in the cloud-based service.

The MessageCopyForSMTPClientSubmissionEnabled parameter specifies whether to copy the sender for messages that are sent using SMTP client submission (SMTP AUTH). Valid values are:

  • $true: When the user's account sends messages using SMTP AUTH, a copy of the message is sent to the users's mailbox. This is the default value.
  • $false: When the user's account sends messages using SMTP AUTH, a copy of the message isn't sent to the users's mailbox.
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
Applies to:Exchange Online

For a list of all available syntax for PowerShell you can head over to the following reference article from Microsoft:

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