diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index c88c62e65..8d625a840 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -87,7 +87,6 @@ Layout/ClosingParenthesisIndentation:
 # Cop supports --auto-correct.
 Layout/CommentIndentation:
   Exclude:
-    - 'app/models/mailer.rb'
     - 'lib/redmine/wiki_formatting/textile/redcloth3.rb'
     - 'test/unit/lib/redmine/wiki_formatting/markdown_formatter_test.rb'
 
diff --git a/app/models/mailer.rb b/app/models/mailer.rb
index 74ceaecfe..3f3b00e7c 100644
--- a/app/models/mailer.rb
+++ b/app/models/mailer.rb
@@ -643,8 +643,8 @@ class Mailer < ActionMailer::Base
       from = mail_from.format
       list_id = "<#{mail_from.address.to_s.tr('@', '.')}>"
     rescue Mail::Field::IncompleteParseError
-       # Use Setting.mail_from as it is if Mail::Address cannot parse it
-       # (probably the emission address is not RFC compliant)
+      # Use Setting.mail_from as it is if Mail::Address cannot parse it
+      # (probably the emission address is not RFC compliant)
       from = Setting.mail_from.to_s
       list_id = "<#{from.tr('@', '.')}>"
     end