Comment 5 for bug 459101

Documented at <https://wiki.ubuntu.com/KarmicKoala/ReleaseNotes#Confirmation%20emails%20for%20new%20UEC%20users%20not%20sent>:

When a new user is created in the UEC admin interface, an email is sent to the user to confirm the registration. A bug in the smtp configuration of UEC prevents the Cloud Controller from accepting and forwarding the confirmation email to the end user. As a workaround, edit the postfix configuration file {{{/etc/postfix/main.cf}}} on the Cloud Controller to comment out the {{{mynetworks}}} option and add a {{{mynetworks_style}}} option set to {{{host}}} instead:

{{{
  #mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
  mynetworks_style = host
}}}

Then reload postfix with {{{sudo service postfix reload}}}. (Bug:459101)