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actionmailer1.rb

class MailboxInterceptor
  def self.delivering_email(mail)
    set_smtp_settings(mail)
    fix_encodings
  ensure
      unset_email_config
  end
 
  private
  def self.set_smtp_settings(mail)
      smtp_settings = tenant_mail_config&.smtp_settings : default_smtp_settings
      ActionMailer.smtp_settings = smtp_settings
      mail.delivery_method(:smtp, smtp_settings)
  end
 
  def unset_email_config
    Thread.current[:tenant_mail_config] = nil
  end
 
  def tenant_mail_config=(mail_config)
    Thread.current[:tenant_mail_config] = mail_config
  end
 
  def tenant_mail_config
    Thread.current[:tenant_mail_config]
  end
end
ActionMailer::Base.register_interceptor(MailboxInterceptor)