Dont Exit

Im trying to watch a log folder, and when the log folder is changed to email me with the log file as an attachment, so googling about someone has done 99.9% of the work already:-
stackoverflow.com/questions/22294395/script-to-send-new-files-via-email-from-monitored-folder

So modifying it to work for me:-

$watchPath = "C:\Test Folder (3)\"

$sendToList = @("myemail@domain.com")
$sendFrom = "folderChange@domain.co.uk"
$emailSubject = "File '{0}' changed"
$smtpHost = "192.168.1.23"

$watcher = New-Object System.IO.FileSystemWatcher 
$watcher.Path = $watchPath
$watcher.IncludeSubdirectories = $false
$watcher.EnableRaisingEvents = $true

$changed = Register-ObjectEvent $watcher "Changed" -Action { 

    Send-MailMessage -SmtpServer $smtpHost -To $sendToList -from $sendFrom -Subject ($emailSubject -f $eventArgs.Name) -Attachments $eventArgs.FullPath

} 

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Code seems to run, but exits after completing. Is there a way to stop the script from exiting so the email event will work?

Thank you in advance