Fixing puppet-lint errors.

alpine/manifests/init.pp

@@ -9,15 +9,15 @@ class alpine {
         $mail_server = "mail.${domain}"
     }
     if ! $mail_domain {
-        $mail_domain = "${domain}"
+        $mail_domain = $domain
     }
-    
+
     file { "/usr/bin/pine":
         ensure  => link,
         target  => "/usr/bin/alpine",
         require => Package["alpine"],
     }
-    
+
     file { "/etc/pine.conf.fixed":
         ensure  => present,
         content => template("alpine/pine.conf.fixed.erb"),
@@ -26,5 +26,5 @@ class alpine {
         group   => root,
         require => Package["alpine"],
     }
-    
+
 }