This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  techtuni@pro.skyhost.pk
    (generated from butner@zambeel.com)
    LMTP error after RCPT TO:<techtuni@pro.skyhost.pk>:
    550 5.1.1 <techtuni@pro.skyhost.pk> User doesn't exist:
    techtuni@pro.skyhost.pk