To reinforce what Greg said, I've implemented the mail-to-kindle feature on Unglue.it, and its complexities are legion, though you might think it's easy.

For example:
https://unglue.it/work/383018/download/

Gutenberg on Unglue.it:
https://unglue.it/free/gtbg/

The feature requires user registration, which is not low maintenance, and for PG, would require CAPTCHA. While the basic service is easy, preventing abuse is really hard. Registration spam is already a huge problem, but when you add a emailer loaded with attachments, you provide an attractive tool for account hijacking thieves. So in practice, you really have to lock down the mail-to-kindle service.

A high profile MTA is not something you can run on your own, and the good ones aren't free.

Eric

Eric Hellman
President, Free Ebook Foundation
Founder, Unglue.it https://unglue.it/
https://go-to-hellman.blogspot.com/
twitter: @gluejar

On Apr 9, 2020, at 8:49 AM, Greg Newby <gbnewby@pglaf.org> wrote:

On Thu, Apr 09, 2020 at 01:41:44AM -0400, Tim Hare wrote:
On a book information page, there are options for DropBox, Google Drive, and
OneDrive - but no option to e-mail it?   If I could choose to e-mail it
(even if it only allowed the email I signed in with),  I could forward (or
send) it to the e-mail address of my Kindle.

Hi, Tim. Project Gutenberg isn't in the business of running email servers for website users. We would need to set up outbound email processes (i.e., mail transfer agents) and related infrastructure. We would also then be transiting those email addresses through our servers, and therefore would need to add extra policy & procedure for privacy.

Instead, all the files are simple to download, and then you can email them yourself. The "mobile reader" how-to on the front page of www.gutenberg.org has our other guidance for the various mobile readers and handheld devices.

I hope this explanation is useful. We do know how to send email, but this particular use case is not in our chosen scope of operations.

Best,
 Greg

Dr. Gregory B. Newby
Chief Executive and Director
Project Gutenberg Literary Archive Foundation www.gutenberg.org
A 501(c)(3) not-for-profit organization with EIN 64-6221541
gbnewby@pglaf.org
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