Invalid delivery method :letter_opener

[Moji00f]

Hi guys
when I create a new ticket I've gotten an error 'Invalid delivery method :letter_opener`

Extracted source (around line #164): headers['Message-ID'] = "<#{ticket.message_id}>" end mail(to: ticket.assignee.email, subject: 'Ticket assigned to you: ' + ticket.subject, from: ticket.reply_from_address) end
Rails.root: /opt/bk

Application Trace | Framework Trace | Full Trace
app/mailers/notification_mailer.rb:164:in assigned' app/mailers/notification_mailer.rb:47:in incoming_message'
app/controllers/tickets_controller.rb:253:in notify_incoming' app/controllers/tickets_controller.rb:190:in create'

Request
Parameters:
{"utf8"=>"✓", "authenticity_token"=>"Snc04jSpe/epEP1nNMMqUPTJxJ+C+PYGphBwrQ9vdqPe+0VLx5+IMJmGqcFKJYIPVaHQqQnXbWZND4XbTE1uDg==", "ticket"=>{"content_type"=>"html", "from"=>"moji.ahmadi87@yahoo.com", "to_email_address_id"=>"", "subject"=>"bugs", "assignee_id"=>"", "priority"=>"unknown", "content"=>"<div>test</div>"}, "commit"=>"Create Ticket"}

Response
Headers:
None

[frenkel]

You're running brimir in development mode, you should use the production environment.