Cannot email to Kindle after release 5.29

Bug #1989282 reported by Kirill Romanov
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Fix Released

Bug Description

I see that bug was already marked as fixed in, but the problem is still exists for me, even in Calibre 6.4.

I'm on Windows 10.

This is how sent message looks:

To: <myemail>

Subject: E-book: =?utf-8?b?0KbQstC10YLRiyDQtNC70Y8g0K3Qu9C00LbQtdGA0L3QvtC9?=
Date: Sun, 11 Sep 2022 17:24:12 +0300
Message-Id: <email address hidden>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="===============6880818400639004053=="

You will not see this in a MIME-aware mail reader.

Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64


Content-Type: application/epub+zip
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
 filename="Tsviety dlia Eldzhiernona - Deniiel Kiz.epub"
MIME-Version: 1.0


Revision history for this message
Kovid Goyal (kovid) wrote : Fixed in master

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased

Changed in calibre:
status: New → Fix Released
Revision history for this message
Kirill Romanov (djaler1) wrote :

Sorry, but looks like this doesn't help. I just tried 6.5.0

Revision history for this message
Kirill Romanov (djaler1) wrote :
Revision history for this message
Kovid Goyal (kovid) wrote :

Sigh what incompetent monkeys does amazon employ? I guess I might as well nuke the body text of the email as well. That's the last thing in Cyrillic in the email, which amazon apparently cant handle.

Revision history for this message
Kirill Romanov (djaler1) wrote :

Maybe I don't understand something, but for me it looks like problem in mail generation, not in its processing on Amazon side. Because, as you can see, in working variant file is actual attachment, but in current version it is encoded as base64 string

Revision history for this message
Kovid Goyal (kovid) wrote :

all binary data has to be base64 encoded in email.

Revision history for this message
Antonio Camas (buhoinquieto) wrote :


This fix has created a problem when sending books via email to kindle.

Now the title of the book in the kindle is a set of random characters. The real title doesn't appear in the kindle.

I had to rollback to 6.4 version.

My suggesting is to revert the commit introducing this change. Or at least make it configurable so that the legacy behavior can be kept for most user.


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