https://bugs.kde.org/show_bug.cgi?id=487029
Bug ID: 487029
Summary: kmail uses media type literal packet in OpenPGP
Classification: Applications
Product: kmail2
Version: 6.0.2
Platform: unspecified
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: folders
Assignee: kdepim-b...@kde.org
Reporter: theodor-andreas.boer...@gmx.de
Target Milestone: ---
SUMMARY
When encrypting messages in OpenPGP/MIME format, kmail uses the format tag 'm'
in the literal data packet inside the OpenPGP Message, while in RFC 4880, only
are 'b', 't' and 'u' are defined. Because of that, some MUAs do not display the
decrypted message.
kmail changed from using 'b' to using 'm' between 5.24.5 and 6.0.2.
STEPS TO REPRODUCE
1. Compose an encrypted message.
2. Export the message, save it into an imap folder, or send it to another
mailbox.
3. Try to view the message in Mozilla Thunderbird.
OBSERVED RESULT
Thunderbird shows obscure error message.
EXPECTED RESULT
The message should be displayable by Thunderbird (and other MUAs).
ADDITIONAL INFORMATION
Relevant section in RFC 4880:
https://datatracker.ietf.org/doc/html/rfc4880#section-5.9
Draft for the 'm' format tag:
https://www.ietf.org/archive/id/draft-moscaritolo-openpgp-literal-01.html
You can use `gpg --list-packets` to find out which format tag was used in an
OpenPGP Message.
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