New Outlook Not Sending Emails

Question

Hi

since new outlook has come through my admins computer has had constant issues, now it will only receive emails and not send, i have checked all server settings etc which appear to be ok, however i still cannot get it to send emails

any suggestions?

Answer 1

Hi @Hanna,  

Hope things are running smoothly on your end. 

Following up on the support thread we've been working on. I hope the information I shared in my previous answer resolve the issue you were facing. If you are still facing the same issue or need assistance with anything else, kindly respond to this email, and I will be happy to help. 

We want to make sure everything is working as expected and that your experience remains uninterrupted. 

Thank you for your patience and understanding throughout the troubleshooting process.  

I look forward to hearing from you soon! 

Answer 2

Hi @Hanna, 

Good day to you! Welcome to Microsoft Q&A forum. 

I understand that your administrator’s computer is experiencing issues with the New Outlook for Windows, it can receive emails but cannot send them. I appreciate you confirming that the server settings appear correct. Below are targeted troubleshooting steps for the New Outlook experience, based on recent updates and known issues. 

1/ App password requirement 

If your email provider uses two-factor authentication (2FA), you may need to generate an App Password: 

• Visit your email provider’s security settings. 
• Generate an app-specific password and use it in Outlook instead of your regular password  

2/ Firewall or antivirus interference 

Security software may block outgoing mail: 

• Temporarily disable firewall/antivirus. 
• Try sending an email. 
• If successful, add Outlook as a trusted app and allow SMTP traffic on port 587  

3/ Check for known issues 

Microsoft has acknowledged several issues in recent updates to New Outlook: 

• [FIXED] Error: “You may need to make an app password” when sending from third-party accounts. 
• [INVESTIGATING] Issues with account setup and outgoing mail for some providers  

You can monitor and report issues via the New Outlook Known Issues page  

4/ Remove and re-add the account 

• Fully remove the email account from New Outlook. 
• Re-add it using manual setup or advanced setup to ensure correct SMTP configuration  

5/ Update Outlook and Windows 

Ensure both are fully updated: 

• Outlook: Go to Settings > About Outlook > Check for Updates 
• Windows: Settings > Windows Update > Check for updates 

6/ Try sending from Outlook web access (OWA) 

• If sending fails in the desktop app, try sending from Outlook on the web. This can confirm whether the issue is local to the app or account-wide. 

For reference: New Outlook app not sending or receiving emails 

Note: Microsoft is providing the above information as a convenience to you. Some of the websites are not under Microsoft's control. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link    

If the issue still persists, I recommend: 

• Consider switching temporarily to Classic Outlook, which offers more manual control over account settings. 
• Contact your email provider to confirm compatibility with New Outlook. 
• Reach out to Microsoft 365 Admin Center so our engineering team can review backend logs and provide targeted assistance.    

I hope this message finds you well and if there’s anything else I can help with, just let me know. I’m happy to help.  

Wishing you a great day. 

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