As seen in powershell technet, try to use:
$output = <your script>.ps1 | out-string
Send-MailMessage -body $output
And here in the library see help for this Send-MailMessage command: https://technet.microsoft.com/en-us/library/hh849925.aspx
This command will send all the output... Another way is to improve the code, catching the exception and sending e-mail messages with your useful content (like stacktrace...)
Hope this could find useful
Regards