```ruby
# Copyright 2011-2017, The Trustees of Indiana University and Northwestern
#   University.  Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
# 
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software distributed
#   under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
#   CONDITIONS OF ANY KIND, either express or implied. See the License for the
#   specific language governing permissions and limitations under the License.
# ---  END LICENSE_HEADER BLOCK  ---

class CommentsMailer < ActionMailer::Base
  default :to => Settings.email.comments
  
  def contact_email(comment)
    @comment = OpenStruct.new(comment)
    mail(:from => @comment.email, :subject => @comment.subject)
  end
end
```

Send repository comments from known account
user
```ruby
# Copyright 2011-2017, The Trustees of Indiana University and Northwestern
#   University.  Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed
#   under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
#   CONDITIONS OF ANY KIND, either express or implied. See the License for the
#   specific language governing permissions and limitations under the License.
# ---  END LICENSE_HEADER BLOCK  ---

class CommentsMailer < ActionMailer::Base
  default to: Settings.email.comments

  def contact_email(comment)
    @comment = OpenStruct.new(comment)
    mail(from: Settings.email.comments, reply_to: @comment.email, subject: @comment.subject)
  end
end
```
assistant