Shared mailbox replies are missing from Sent Items
The reply is in your personal Sent Items, while the team mailbox looks unanswered. How can the next colleague see what you sent before replying to the same customer?
A shared inbox can show an incoming customer request without showing the answer a colleague already sent. To keep future replies available to the team, an administrator must enable sent-item copies for the shared mailbox. If the next colleague also needs older replies, copy those into the shared mailbox separately.
A Microsoft Q&A user reported that messages sent from the shared address appeared in their own Sent Items. For an Exchange Online shared mailbox used through Outlook, the administrator changes the mailbox’s sent-item settings. A distribution list delivers mail to its members and does not have these shared-mailbox settings.
The missing reply may be in the sender’s personal Sent Items
Microsoft’s shared mailbox configuration guide says sent messages are saved by default in the sender’s personal Sent Items. A message can show the shared address to its recipient while its saved copy remains in the sender’s personal mailbox.
Ask the sender to search their personal Sent Items using the recipient, subject, and approximate sending time. Open the result and check its From address. Then expand the shared mailbox and look in its own Sent Items. When two folders have the same name, check the mailbox heading above each one.
In new Outlook, select a folder within the shared mailbox before searching for the reply there. Searching only your personal mailbox will not show what is in the team folder. Compare the recipient and timestamp as well as the subject; a long conversation may contain several similar replies.
Finding the personal copy can prevent an unnecessary second reply to the customer. It does not establish that the recipient read the message. If delivery is disputed, investigate that separately from the location of the saved copy.
Use the shared From address with the required access and sending permissions
In new Outlook’s shared mailbox instructions, the mailbox appears under Shared with me in the folder pane. Expand it to reach its Inbox, Drafts, and Sent Items. After an administrator adds you as a member, restart Outlook if necessary. You can also right-click your account name and use Add shared folder or mailbox to add the address.
For a new message, use Options → Show From if the field is hidden, then select the shared address. Use the other-address option if it is absent from the list. Select the shared From address when replying as well: a message sent from your personal address remains a personal reply even after shared copies are enabled.
Exchange Online distinguishes mailbox access from sending permission:
| Permission | What it allows | What it does not grant |
|---|---|---|
| Full Access | Open the mailbox and read, add, or remove items | Permission to send from it |
| Send As | Send with the shared mailbox shown as the sender | Access to read the mailbox |
| Send on behalf | Send with the delegate identified as acting on behalf of the mailbox | Access to read the mailbox |
If both sending permissions are assigned, Send As takes precedence. Decide with your administrator whether recipients should see only the shared mailbox as the sender or also see the colleague sending on its behalf. The copy settings below do not grant either sending permission; ask the administrator to correct that permission if Outlook refuses to send.
Enable the shared mailbox’s sent-item copies
An administrator can enable copies in the Microsoft 365 admin center. Go to Teams & groups → Shared mailboxes and select the mailbox. Open Edit under Sent items, enable the copy options for the sending permissions your team uses, and save. These mailbox settings control copying; Outlook’s folder display only changes which folders you see.
| Option | Messages covered |
|---|---|
| Copy items sent as this mailbox | Messages sent using Send As |
| Copy items sent on behalf of this mailbox | Messages sent using Send on behalf |
Microsoft’s troubleshooting article specifies the server-side approach, Method 1, for new Outlook. Do not substitute an old classic Outlook registry recipe. Administrators using PowerShell must likewise distinguish the Sent As and Send on Behalf copy properties.
A useful request is: “Replies sent as [email protected] appear only in my personal Sent Items. Please enable copies in the shared mailbox and confirm that the colleague taking over can read that folder.” Replace the example address and include your account and Outlook version.
Microsoft’s automatic-copy guidance describes keeping a copy for both the sender and the mailbox owner. The shared copy is additional, so leave the personal copy in place. Existing classic Outlook settings can alter where copies are saved, as discussed below.
If copies were enabled this afternoon, look for this morning’s replies in the sender’s personal folder. Record the change time and send a new message to check that a shared copy appears. Copy any earlier replies needed for the handover using the procedure below.
Have a second colleague open the shared copies of a new message and reply
After saving the setting, send a fresh message and a reply to an approved test recipient. Give them distinctive subjects so neither is confused with a message sent before the change. Work through these checks with the colleague taking over.
| Action | Sender checks | Second colleague checks |
|---|---|---|
| Send a new message from the team address | From address, time, and saved copy | The same message opens in shared Sent Items |
| Reply to a message in the shared Inbox | From address and recipient | The reply body and attachment are accessible |
| Test any other sending mode the team uses | Whether the sender is shown as the shared mailbox alone or as a colleague sending on its behalf | That mode also produces the expected copy |
The sender may be able to open the shared copy while the incoming colleague lacks access to that folder. Have the colleague open the same reply and attachment from their own account. If either is unavailable, give the administrator that account, the shared mailbox address, and the message’s subject and time so they can check access.
For a delivery problem, ask an administrator to use Exchange Online message trace. It can identify received, rejected, deferred, or delivered messages and related events. Sent Items shows the saved copy; message trace shows what happened during delivery. Neither proves that a person read the reply.
Copy the older replies needed for the handover
The Q&A answer linked above explains that the setting applies to future messages. Existing mail remains in personal Sent Items. If the incoming colleague needs last week’s answers, identify those records and copy them separately.
Decide which conversations and dates to copy before selecting messages. For an open customer case, search the customer address and conversation subject, then verify the shared From address. Selecting the entire personal Sent Items folder can mix unrelated correspondence into the team mailbox. Record the period covered and the destination folder.
Outlook’s copy instructions describe right-clicking a message and choosing Copy to folder in new Outlook, or using Move → Copy to Folder in classic Outlook. Choose the shared destination where it is available and you have permission to add items. If it cannot be selected or the operation fails, give the administrator the destination and error rather than changing access rights yourself.
Copy one message first. Have the colleague open it and compare the recipient, body, and attachment before copying the rest. Copying leaves the original in place; moving does not. Do not forward the historical reply to the customer merely to create another record.
In the handover note, record the period you copied, any cases still outstanding, and when automatic copying began. The next colleague can use those dates to identify gaps between the historical records and new shared copies.
Check classic Outlook settings if two copies appear
Two entries in shared Sent Items do not by themselves establish two deliveries. Microsoft’s troubleshooting table shows that DelegateSentItemsStyle set to 1 combined with MessageCopyForSentAsEnabled set to True produces two shared copies and no personal copy.
Tell the administrator if the PC already used registry settings to control where sent messages are saved. Include the Outlook version, the previous configuration if known, and which folder contains the duplicates. The administrator needs that configuration to address the repeated copies; deleting one duplicate after every reply leaves the cause in place.
A separate Microsoft troubleshooting article covers messages remaining in the Outbox when DelegateSentItemsStyle is 1 and Outlook uses Online Mode rather than Cached Exchange Mode. This is a specific combination, not a diagnosis for every delayed message. Let the administrator check the existing configuration and repeat a fresh sending test after correcting it.
Before completing the handover, have the next colleague open a reply, identify its customer conversation, and check which older replies are still missing. Give that colleague the shared address, whether the team uses Send As or Send on behalf, when automatic copying began, and the dates and destination folder of the older replies you copied.