eM Client is my default email application I have both eM Client and Outlook and even though I"m using eM Client, it wants to use Outlook for outgoing emails.
We’re sorry you’re experiencing this issue. Could you please check that the program is set as default in Control Panel -> Programs -> Default Programs -> Set your default programs? Windows’ Default Apps is sometimes not completely reliable.
If this doesn’t help, could you please go to the ‘Turn Windows features on or off’ window (you can get there by searching this name through the start menu search) and make sure the .NET Framework 3.5 box is checked?