I am not able to send emails in outlook using microsoft 365.

Question

Outlook on Microsoft 365 will not send emails. I spoke with my email provider and they looked at the settings and found them to be correct. I was advised to contact Microsoft.

Answer 1

Hi Dick Kindt

Thank you for reaching out to Microsoft Q&A Forum. I’m sorry you’re running into trouble sending emails in the new Outlook for Windows.

I can see there’s a Q&A Assist reply under your post. To avoid repeating it, could you tell me if you’ve tried those steps yet, and what happens when you try?

Also, when you try to send, do you see a specific error message? Or emails stuck in Outbox?

In the meantime, please try the following steps:

1. Try sending on Outlook on the web

Please sign in at Outlook on the web and try sending an email there and check if it works.

2. Check the Outbox folder in app

• If messages are stuck in Outbox, close Outlook, reopen it, then try sending again.
• If it still won’t send, move the message to Drafts, open it from Drafts then Send again

3. Firewall/antivirus check

Temporarily disable firewall or antivirus software to see if they are blocking outgoing mail.

For more details, please refer to this official guide: I can't send or receive messages in Outlook - Microsoft Support

Looking forward to your reply so I can guide you further. Thank you for your time and understanding.

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Answer 2

If you're unable to send emails in Outlook using Microsoft 365, there are several common issues you can check:

1. Outdated Software: Ensure that your Outlook client and Windows operating system are up to date. Running Windows Update can help resolve issues caused by outdated software.
2. Corrupted Profile: A corrupted Outlook profile can prevent you from sending emails. You might want to create a new profile to see if that resolves the issue.
3. Service Issues: If multiple users in your organization are experiencing similar problems, it could be due to a service issue with Microsoft 365. You can check the Microsoft 365 Service health status to see if there are any ongoing issues affecting Exchange Online.
4. Diagnostic Tools: You can use the Microsoft 365 Diagnostic tool to troubleshoot connectivity issues. This tool performs automated checks and provides possible solutions.

If these steps do not resolve your issue, consider reaching out to Microsoft support for further assistance.

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References:

• Fix Outlook connection problems for Microsoft 365 account
• Fix software update and profile issues