Email Class - Not able to set Return-Path header

[eluser]Unknown[/eluser]
I was having a similar problem with emails being rejected. I fixed it by removing the space after the -f switch on line 1519 of Email.php. There's a comment directly above that line that says they added the space because some servers seem to require it. It would seem my host (rackspacecloud) requires there not be a space after the switch and the email address. Hope this helps someone else