Can't see send messages anywhere!

Restore the Folder Pane in classic Outlook, then open the Sent Items folder under the account from which the messages were sent.

1. In Outlook, select View > Layout > Folder Pane > Normal.
   Alternatively, select the > at the side of the Outlook window to expand the pane.^1^
2. Select the arrow beside your email account to expand its folders.
3. Select Sent Items. If Outlook contains multiple accounts, check the Sent Items folder under the specific account used to send the message.^2^

If Sent Items is visible but new messages are missing

Enable Outlook’s option to retain sent-message copies:

1. Select File > Options > Mail.
2. Scroll to Save messages.
3. Select Save copies of messages in the Sent Items folder.
4. Select OK, send a new test message, and confirm that it appears in Sent Items.^2^

This setting affects messages sent afterward; it does not restore copies that were never saved.

If only particular messages are missing

• Check Outbox. A message remaining there has not been sent successfully.
• Check Deleted Items or Trash.
• Search within Sent Items using the recipient or subject, such as To:recipient-name or Subject:keyword.
• If older sent messages are missing, select File > Account Settings > Account Settings, choose the account, select Change, and move Mail to keep offline to a longer interval.^2^

References

1. Show all folders in Outlook | Microsoft Support
2. View sent email | Microsoft Support