```ruby
class ReceivedEmail
  include ActiveModel::Model
  EMAIL_REGEX = /[^\s:,;‘"`<>]+?@[^\s:,;'"`<>]+\.[^\s:,;‘“`<>]+/

  attr_accessor :sender_email
  attr_accessor :headers
  attr_accessor :subject
  attr_accessor :body
  attr_accessor :locale

  def save
    if valid?
      UserMailer.start_decision(received_email: self).deliver_now
    else
      # send failure email
    end
  end
  alias :save! :save

  def valid?
    email_addresses.length <= Rails.application.secrets.max_pending_emails
  end

  def email_addresses
    body.scan(EMAIL_REGEX).uniq.reject { |email| email == self.sender_email.scan(EMAIL_REGEX) }
  end
end
```

Add banned chars to ReceivedEmail regex
user
```ruby
class ReceivedEmail
  include ActiveModel::Model
  BANNED_CHARS = %(\\s:,;'"`<>)
  EMAIL_REGEX = /[^#{BANNED_CHARS}]+?@[^#{BANNED_CHARS}]+\.[^#{BANNED_CHARS}]+/

  attr_accessor :sender_email
  attr_accessor :headers
  attr_accessor :subject
  attr_accessor :body
  attr_accessor :locale

  def save
    if valid?
      UserMailer.start_decision(received_email: self).deliver_now
    else
      # send failure email
    end
  end
  alias :save! :save

  def valid?
    email_addresses.length <= Rails.application.secrets.max_pending_emails
  end

  def email_addresses
    body.scan(EMAIL_REGEX).uniq.reject { |email| email == self.sender_email.scan(EMAIL_REGEX) }
  end
end
```
assistant