Bug 400947

Created attachment 116250 [details]
Test message

SUMMARY

Even if a HTML mail is displayed with external references (images) manually requested, the images are not printed or previewed.

STEPS TO REPRODUCE
1. Load the attached sample message into KMail.  It is has only one external reference and is safe to open, and contains no personal information.
2. Activate HTML message display with "by clicking here" at the end of the "Note: This is a HTML mesasage..." header.
3. Load external references with "by clicking here" at the end of the "Note: This HTML message..." header.
4. Observe that the white logo is shown in the blue box at the top.
5. Select File - Print Preview. In the preview observe that the logo is replaced by a "broken image" graphic.
6. Close the preview and select "Print..." to an printer or to a PDF file. Observe that the same "broken image" is printed.

OBSERVED RESULT

"Broken image" graphic when printing

EXPECTED RESULT

External referenced image shown when printing, as on the screen.

SOFTWARE/OS VERSIONS
Windows: 
MacOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.14.80
KDE Frameworks Version: 5.52.0
Qt Version: 5.11.2

ADDITIONAL INFORMATION

KMail configuration options:
Misc - Printing - Print background colour and images is set to ON.
Security - Reading - Prefer HTML to plain text is set to OFF.
Security - Reading - Allow messages to load external references is set to OFF.

Bug 391030 may be the same, but that does not make it clear whether HTML and/or external references are allowed or requested.