antiwork/gumroad · error · ArgumentError

Please enter a valid Kindle email address

Error message

Please enter a valid Kindle email address

What it means

Raised as ArgumentError by SendableToKindle#send_to_kindle (app/modules/sendable_to_kindle.rb:12) when the supplied kindle_email does not match KINDLE_EMAIL_REGEX (config/initializers/aws.rb:34). The regex is strict about the domain: the address must end in @kindle.com (case-insensitive), be 3–255 characters, and have no leading/consecutive dots — so a Gmail/Yahoo address fails even though it is a valid email. The method then enqueues CustomerMailer.send_to_kindle on the critical queue, optionally passing the url_redirect whose id locates the buyer-specific stamped PDF.

Source

Thrown at app/modules/sendable_to_kindle.rb:12

# frozen_string_literal: true

module SendableToKindle
  extend ActiveSupport::Concern

  included do
    # `url_redirect` provides the purchase context needed to locate the
    # buyer-specific stamped copy of a stamp-enabled PDF. Without it the
    # original (un-watermarked) file would be emailed, bypassing the
    # seller's PDF stamping setting.
    def send_to_kindle(kindle_email, url_redirect: nil)
      raise ArgumentError, "Please enter a valid Kindle email address" unless kindle_email.match(KINDLE_EMAIL_REGEX)

      CustomerMailer.send_to_kindle(kindle_email, id, url_redirect&.id).deliver_later(queue: "critical")
    end
  end
end

View on GitHub (pinned to afeacbd394)

Solutions

1. Instruct the user to enter their @kindle.com address (Kindle device settings → Send-to-Kindle email); validate the same pattern client-side before submitting.
2. Strip whitespace and downcase before validating.
3. Rescue ArgumentError around send_to_kindle and re-prompt for a corrected address instead of a 500.

Example fix

# before
purchase.send_to_kindle(params[:email]) # ArgumentError for non-@kindle.com

# after
email = params[:email].to_s.strip.downcase
unless email.match?(KINDLE_EMAIL_REGEX)
  return { error: "Please enter a valid Kindle email address (must end in @kindle.com)." }
end
purchase.send_to_kindle(email)

email = kindle_email.to_s.strip.downcase
return { error: 'Enter your @kindle.com address.' } unless email.match?(KINDLE_EMAIL_REGEX)

begin
  purchase.send_to_kindle(email, url_redirect:)
rescue ArgumentError => e
  render json: { message: e.message }, status: :unprocessable_entity # re-prompt for a @kindle.com address
end

When it happens

Trigger: Calling purchase.send_to_kindle(email) / library-item send-to-Kindle with any address not ending in @kindle.com — regular email addresses, typos like 'user@kindle.co', empty strings, or addresses with consecutive dots. User.kindle_email is validated against the same regex on save.

Common situations: Buyers entering their normal email instead of the @kindle.com address from their Kindle device settings; whitespace or a second @; front-end accepting any RFC-5322 address without the domain restriction.

Related errors

• Something went wrong.
• This commission has already been completed, so its files can
• This commission's deposit is no longer in a completable stat
• Attach at least one file before completing this commission.
• You have to confirm your email address before you can do tha

AI-assisted analysis of antiwork/gumroad@afeacbd394 (2026-08-21). Data as JSON: /api/errors/548c7eb0b7feac1e. Report an issue: GitHub.