I have observed a problem when files are embedded directly in forum postings.
When the forum message is mailed out the links still exist and point back to Moodle. However, Outlook flags them as a possible security risk. Accepting the risk just does nothing. Links that are not deemed a risk (e.g. PDFs) work fine. You are sent to the browser and asked to login if required.
Has anybody else seen this or got any thoughts?