Workaround to send email in plain text
Email appears as "noname" attachment in Gmail accounts (and probably others but I did not test on):
Content-Type: application/octet-stream
Content-Transfer-Encoding: base64
So use cat -v as a workaround
See: http://ask.fclose.com/305/plain-pipelined-content-application-octet-stream-attachment
Also recommended to apply this fix to all other server scripts for consistency reasons.