Sometimes it happens: you simply cannot send emails. You open your favorite mail client or software (Mozilla Thunderbird, Outlook Express, SendBlaster…), write a few lines, insert the recipients’ addresses, click “Send” and… An error is returned.
Method 8: Sending an email in Safe Mode. Make sure Outlook is completely closed. Open a Run window, type outlook /safe and hit Enter. If Outlook fully starts in Safe Mode, click on the File tab and navigate to Options. Now click on the Add-ins tab to expand it. Expand the drop-drop down menu next to Unable to send emails from Outlook [Solved] - CCM Apr 11, 2019 Error occurs when you send or receive an email message in Jul 16, 2019 Why Outlook is Not Sending Emails and What You Can Do Open Outlook. Click the “Tools” tab. Select the “Mail Setup” tab or the “Send” tab depending on your version of Microsoft Outlook. Ensure that the “Send Immediately” option is checked.
Jul 16, 2019
Outlook Cannot Send Mail Solved - Windows 10 Forums
Send/Receive errors - HowTo-Outlook
Verify your SMTP outgoing email settings. In the Thunderbird menu bar, click the Tools Edit menu and select Account Settings, or click the Application menu button and select Options Preferences and Account Settings from the sub-menu, and select Outgoing Server (SMTP) from the bottom of the list in the left panel. Check that the settings are the same as documented on the mail settings article