How to fix Outlook failing to send emails. Is receiving emails.

Question

My outlook program is receiving emails but cannot send emails.

Answer 1

Try these fixes in order:

1. Check whether Outlook is offline. In classic Outlook, look at the status bar at the bottom. If it shows Disconnected, Working Offline, or Trying to connect..., go to Send/Receive > Work Offline to switch back online, then try sending again.
2. Verify the internet connection. Open a browser and try loading http://www.microsoft.com or http://www.bing.com. If those do not open, fix the network connection first.
3. Check for a stuck message with a large attachment. Open the Outbox and review the oldest unsent message first. If it has an attachment larger than 20 MB, remove it and attach a smaller file or a link instead, then resend.
4. If using new Outlook, force a sign-in again if the password was changed. Select the icon next to the email account name, choose Continue, and sign in with the updated password. If prompted to create an app password, get it from the email provider and use that in Outlook.
5. If using classic Outlook and the password changed recently, update the password there as well. If the stored password is outdated, Outlook may still receive in some cases but fail to send until the account credentials are updated.
6. Start classic Outlook in safe mode to rule out add-ins. Press the Windows key, type outlook.exe /safe, and press Enter. If sending works in safe mode, an add-in is likely interfering. Creating a new Outlook profile is the recommended next step.
7. Repair the Outlook profile. If safe mode helps or the issue continues, repair the profile or create a new one.
8. Repair the Outlook app. If the problem still remains, run an Office repair. This can take up to half an hour.
9. Check antivirus email scanning. Some antivirus products block sending and receiving after detecting a virus. If email scanning is enabled, check the antivirus product and clean any detected threat.
10. If none of the above works in classic Outlook, run the Classic Outlook troubleshooters. If that still does not resolve it, contact support.

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References:

• I can't send or receive messages in Outlook
• Issues sending and receiving email