We've had reports that a select number of business clients are experiencing email issues since upgrading machines to Windows 10.
The problem has been found when Outlook is using both exchange and Imap/POP3 accounts, The IMAP/POP3 account will receive, but not send.
Running the command sfc /scannow as and administrator has been found to fix this issue.
Not sure how to run that command? Read our guide below.
In the search/cortana bar type CMD.
When the command prompt program is found, right-click and select Run As Administrator.
The command prompt will open
In the black command prompt, type: sfc /scannow and press enter
When the scan has finished, try Outlook again.