If you can't reply or forward an email on Outlook due to Cannot send this item error, make sure your Outlook is up-to-date and then use these fixes.

Microsoft is addressing an Exchange Online bug causing Outlook mobile users to face crashes and 12-hour email sync delays.

If your email is stuck in the Outbox of Outlook, and not sending, try these troubleshooting steps to send the messages that are stuck in Outlook Outbox.

If you have set up your Outlook to connect to your ISP's email account but not Outlook 365, then you will need to do that in order to use it to send and receive emails through it. The following ...

Microsoft has acknowledged a new issue affecting Outlook for Microsoft 365 users and causing email-sending problems for those with too many nested folders.

Ensure smooth email delivery by checking Outlook's status, restarting the app, and maintaining stable internet connectivity ...