Update Exchange 2010 Transport Rule From Text File Using Powershell

Here's a short script that reads the contents of a text file and updates the signature of all outgoing email with the contents of the text file.  Useful for delegating the task of maintaining corporate signatures to non-admins.

if (test-path C:\sig.txt )
{
 $signature = Get-Content "C:\sig.txt"
 set-TransportRule -Identity 'External Email Disclaimer' -Name 'External Email Disclaimer' -Comments 'Appends disclaimer to all email that is sent externally.' -ApplyHtmlDisclaimerLocation 'Append' -ApplyHtmlDisclaimerText $signature -ApplyHtmlDisclaimerFallbackAction 'Wrap'
}
else
{
 write-eventlog -logname Application -source MSExchangeTransport -eventID 999 -entrytype Error -message "The signature script failed to run" -category 1 -rawdata 10,20
}