A malicious email sender can circumvent warning messages that would normally display when a user attempts to view executable attachments in Eudora 4.2/4.3. Eudora does not prompt a user with the warning message if they are attempting to open a file that is neither .exe, .com, or .bat.
Inserting the tag
<a href="file:///c:/eudora/attach/file.lnk"\>http ://www.example.com</ a>
in an email message will display as:
in a Eudora email client.
Therefore, when a user clicks on this link, it will automatically open up the executable file without warning.