Thanks to Timur Akhmadeev’s blog I found the solution for the broken links in the MOS HTML updates mail from Oracle Support.
Links in an email are like this:
https://supporthtml.oracle.com/ep/faces/secure/kmDocumentDisplay.jspx?id=1062675.1
but should be like this:
https://supporthtml.oracle.com/ep/faces/secure/km/DocumentDisplay.jspx?id=1062675.1
– note the extra slash between km and DocumentDisplay.
For more details, check Timur’s blog.