Running test-systemhealth | out-File "C:\smtptest.txt" returns me a blank file?

I'm just starting out in the world of powershell scripting and I'm working on a script to run "test-systemhealth" on exchange, chuck the output of that into a txt file and e-mail it to me. That way I can schedule it to run every morning and I can check if my server is fine each morning while sipping away at my coffee. Find attached the code draft for my script.

Problem: everything works but when I run test-systemhealth | out-File "C:\smtptest.txt" it gives me the following message in powershell and I'm left with a blank txt file:

Test-SystemHealth : Database 'Mailbox Database' on server SEMI contains 18 mail
boxes. This database has never had a full online backup.
At line:1 char:18
+ test-systemhealth  <<<< | out-File "C:\smtptest.txt"
Test-SystemHealth : Database 'Public Folder Database' on server SEMI has never
had a full online backup.
At line:1 char:18
+ test-systemhealth  <<<< | out-File "C:\smtptest.txt"
Test-SystemHealth : The Microsoft Exchange System Attendant process on server S
EMI is configured to interact with the desktop. This configuration should only
be used under the guidance of Microsoft Product Support Services.
At line:1 char:18
+ test-systemhealth  <<<< | out-File "C:\smtptest.txt"

test-systemhealth | out-File "C:\smtptest.txt"
 
$SMTPserver = "server.domain.local"
$fileattachment = "c:\smtptest.txt"
$from = "administrator@blah.com"
$to = "me@blah.com"
$subject = "Mail Test"
$emailbody = "Morning Server Test"
 
$mailer = new-object Net.Mail.SMTPclient($SMTPserver)
$msg = new-object Net.Mail.MailMessage($from, $to, $subject, $emailbody)
$attachment = new-object Net.Mail.Attachment($fileattachment)
$msg.attachments.add($attachment)
$mailer.send($msg)

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