I notice that your GetObject line has a "." in it. It should be a comma. You should do some error checking after the GetObject command to verify that you where able to properly get the object for the OU.

Code:

BREAK ON

$ou = GetObject("LDAP://ou=Users,dc=domain,dc=local")
If @ERROR @SERROR ? EndIf
Dim $Filter[0]
$Filter[0] = "user" 
$ou.Filter = $Filter
for each $account in $ou 
   $name = $account.name
   ? "name = $name" 
   $groups = $account.groups
   
   for each $group in $groups 
      $groupname = $group.name
      ?"groupname = $groupname"
      if $groupname = "Internet Mail Access"
         ?"Internet Mail Access is enabled"
         exit 0
      else
         GroupAdd($account,"Internet Mail Denied", $account)
         ?"No Internet Mail"
      endif 
   next
next