DOWNLOAD DelegateSentitemsStyle Registry file

What does this file do:?

The DelegateSentItemsStyle registry setting in Outlook controls where sent items are stored when you send an email on behalf of someone else. By setting DelegateSentItemsStyle to 1, it ensures that the sent items are saved in the Sent Items folder of the mailbox you are sending on behalf of, rather than your own Sent Items folder.


This is particularly useful in scenarios where you manage multiple mailboxes or send emails on behalf of others, as it keeps the sent items organized in the appropriate mailbox.


OUTLOOK SHARED MAILBOX SENT AS 1 Copy IN Sent SHARED MAILBOX's SENT ITEMS ONLY.

Outlooks Application installed on your computer doesn't come with "DelegateSentitemsStyle" already installed into your registry. One would normally have to  Add it to the Registry.

When applying to user registry DO NOT OPEN REGISTRY EDITOR AS ADMINSTRATOR Rather if there are domain user restrictions, it would be better to enter the admin user name and password if prompted. This is how you will find the Preferences folder within the

In specialized mailbox customization such as Having your SharedMailboxes, this registry fix, DelegateSentItemsStyle is for when you want Outlook SharedMailboxes to receive respective Sent item to the sharedbox folder sent items folder instead of the personal inbox sent items folder.

 Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences (Folder)


DUPLICATE OF SENT ITEMS IN OUTLOOK

When using Outlook, you might encounter an issue where sent items are duplicated in the Sent Items folder. This often happens when using IMAP accounts because both the email server and Outlook save a copy of the sent email, resulting in duplicates12.

Causes of Duplicate Sent Items

  1. IMAP Configuration: IMAP servers typically save a copy of sent emails on the server, and Outlook also saves a copy locally. This results in two copies of each sent email in the Sent Items folder2.
  2. Server Settings: Some email providers automatically create a sent item on the server, which Outlook then syncs, causing duplicates2.

Resolving Duplicate Sent Items

To resolve this issue, you can adjust the settings in Outlook:

  1. Disable Saving Sent Items in Outlook:
  • Go to File > Account Settings > Account Settings.
  • Select your IMAP account and click Change.
  • Click More Settings > Sent Items tab.
  • Check the option Do not save copies of sent items1.

DelegateSentItemsStyle Registry Setting

The DelegateSentItemsStyle registry setting in Outlook controls where sent items are stored when you send an email on behalf of someone else. Without adjusting this setting, sent items may not be saved in the intended mailbox, leading to confusion and disorganization34.

Issues Without Adjusting DelegateSentItemsStyle

  1. Sent Items in Wrong Folder: If DelegateSentItemsStyle is not set, emails sent on behalf of another user will be saved in your Sent Items folder instead of the shared mailbox's Sent Items folder4.
  2. Outbox Issues: Emails might remain in the Outbox if the profile is not configured correctly, especially when using online mode instead of cached mode3.

Adjusting DelegateSentItemsStyle

To ensure sent items are saved in the correct folder:

  1. Set DelegateSentItemsStyle to 1:
  • Open the Registry Editor (regedit.exe).
  • Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\<version>\Outlook\Preferences.
  • Create or modify the DelegateSentItemsStyle DWORD value and set it to 1.
  • Restart Outlook3.
By doing this, you can avoid duplicate sent items and ensure that emails sent on behalf of others are stored in the correct Sent Items folder.

When I mean duplicate sent items I'm referring to. one in the outlook user's personal Sent folder  and one in Shared Mailboxes Sent Items, When sent from the Shared Mailbox on-behalf. So i.e when you send form shared folder, the email goes to both sent folders, hence the duplication

DelegateSentitemsStyle (Regedit) + Copy items sent as this mailbox & Copy items sent on behalf of this mailbox (365 admin>group> Shared Mailboxes) = DUPLICATE OF SENT ITEMS IN OUTLOOK