Report and alerts for Exchange Server database backup

Hi

i am trying to use the Get-DailyBackupAlerts.ps1to check the exchange database backup state every day by email 

and i am using this scripts its working fine but I have problem with sending email  

here below the Error

04/16/2015 09:46:53 Alert email will be sent
04/16/2015 09:46:53 Report summary: Alerts 23, OK 0
04/16/2015 09:46:53 Sending email report
04/16/2015 09:46:53 Cannot validate argument on parameter 'From'. The argument is null or empty. Supply an argument that is not null or empty and then try the command again.
04/16/2015 09:46:53 Finished.

my setting the in the file Settings.xml as below 

<EmailSettings>
    <SMTPServer>webmail.domain.com</SMTPServer>
    <SMTPPort>25</SMTPPort>
    <MailFrom>myemailaddress@domain.com</MailFrom>
    <MailTo>myemailaddress@domain.com</MailTo>
  </EmailSettings>

any one can help ?

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Mahmoud