[kmail2] [Bug 336069] New: Mails with "From " in attachment are not signed properly

[Daniel Hornung]

https://bugs.kde.org/show_bug.cgi?id=336069

            Bug ID: 336069
           Summary: Mails with "From " in attachment are not signed
                    properly
    Classification: Unclassified
           Product: kmail2
           Version: 4.11.5
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: crypto
          Assignee: kdepim-bugs at kde.org
          Reporter: daniel.hornung at gmx.de

When attaching a file which contains "From ", the signature is invalid.

Interestingly, the signature is displayed as valid in the sent-mail folder, but
as invalid in the inbox.


Reproducible: Always

Steps to Reproduce:
1. Create a text file with "From " in it
2. Attach the file to an email
3. Sign the email
4. Send it to yourself
5. Check the signatures in the sent-mail folder and in the inbox
Actual Results:  
Signature in the sent-mail folder is OK, signature in the inbox is not.

Expected Results:  
Signatures should be OK.

See the attachments, saved directly from the mail folder.

Interestingly, the mail body & attachment seems to be duplicated in these
mails, with different encodings.

The only difference seems to be the additional ">" in front of the "From "
line.  Also note that upon saving the received email from within KMail with
"File > Save as ...", this ">" is duplicated so that the line becomes ">>From
".

This bug may be related to bug #303305 and maybe also #332036.

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