Cannot Send Emails from Outlook 2010 | Check Receiver Address

Method:1

On your computer, give a double-click on the Outlook 2010 icon to launch the Outlook application.
In the Outlook window, click the File tab and select the Info button at the left-side panel.
Under Account Information, click the Account Settings button.
In the Account Settings window, select your email account from the displayed list and click the Change button.
In the Change Account window, verify the outgoing mail server name and click the More Settings button if you cannot send emails from outlook 2010.
In the "Internet Email Settings" window, click the Outgoing Server tab and select the My Outgoing server (SMTP) requires authentication radio button.
Mark the Use same settings as my incoming server checkbox.
Click the OK button followed by Next to save the applied changes.
Now, check if you are able to send an email from your email account configured on Outlook.
If the problem persists, move on to the next method to resolve the issue.

This method shows how to resolve a corrupted email profile by configuring a new email account.

Open the Windows Control Panel window first, navigate to User Accounts, and select Mail.

In the Mail window, click Add and type the name of your new profile in the Profile Name box.

Click the OK button and select the Manual setup if you cannot send emails from outlook 2010 or additional server types radio button.

Configure the mail server settings and click the Finish button.

Go to the Mail window and select the created profile in the When Starting Microsoft Outlook profile box.

Click OK and launch the Outlook 2010 application to check if the problem is resolved.

Click the Start menu and type "ncpa.cpl" in the search panel.
Hit the Enter button and give a right-click on the internet connection. Select Properties.
Click the Networking tab and check if the Internet Protocol Version 6 (TCP/IPv6) checkbox is marked.
If not, enable it and click the OK button if you cannot send emails from outlook 2010.