If Microsoft Outlook is taking a long time to send emails even if there is nothing queued in your Outbox, most probably the SRS file for your Outlook is corrupted.
Delete Outlook.srs file from C:\Users\”Username“\AppData\Roaming\Microsoft\Outlook
Note: You will be able to see AppData folder only after enabling view Hidden files
And open your Outlook.
New Outlook.srs file will be created and you should be able to send emails without any delay.
Author: Jaseena