Corrected with rubocop cop 'Style/SpaceBeforeBlockBraces'.

app/models/channel/email_parser.rb

@@ -526,7 +526,7 @@ class Channel::EmailParser
   def set_attributes_by_x_headers( item_object, header_name, mail )
 
     # loop all x-zammad-hedaer-* headers
-    item_object.attributes.each{|key, value|
+    item_object.attributes.each {|key, value|
 
       # ignore read only attributes
       next if key == 'updated_at'

lib/sessions.rb

@@ -576,7 +576,7 @@ returns
   end
 
   def self.symbolize_keys(hash)
-    hash.inject({}){|result, (key, value)|
+    hash.inject({}) {|result, (key, value)|
       new_key = case key
                 when String then key.to_sym
                 else key