Which One Of The Following Are Valid Options For The Prefix Of The Datasource Email Address When Using Klipfolio’s Email Attachment Connector?

Which One Of The Following Are Valid Options For The Prefix Of The Datasource Email Address When Using Klipfolio’s Email Attachment Connector?
  • ds
  • ds_
  • ds-
  • ds=
  • ds+, ds_, ds-
  • All of the above
  • None of the above