SmarterMail – No connection could be made because the target machine actively refused it 127.0.0.1:17001

Today i notice my site don't send notice mail to me.
So i go to my mail control panel and yes this error came to me. - -'

after research i found solution to repair .NET 4.0 Client. here we go.

Windows > Control Panel > Programs > Programs and Features

Uninstall/Change on "Microsoft .NET Framework 4 Client Profile"

Repair on that and reboot.

Anything work again.

SmarterEmail permission check failed.

Will show this error

Failed /MailProcessing/ Folder Permissions Test
Notes: Cannot WRITE to the directory. Cannot DELETE from the directory. Please modify the permissions using NTFS.
Failed /App_Data/ Folder Permissions Test
Notes: Cannot WRITE to the directory. Cannot DELETE from the directory. Please modify the permissions using NTFS.

Just give permission Modify to user to pass permission test on both