IE 6.0 (and maybe others) can't download mail
attachments when Popper is accessed via SSL. This
happens due to a missing header:
Pragma: no-cache, blah
I've found the solution to this problem here:
http://www.mail-archive.com/tomcat-user@jakarta.apache.org/msg118603.html
To avoid this problem, you got to edit class.popper.inc
and add the following statement (should be around line
2095):
Header("Pragma: no-cache, blah");
right before:
Header($disp);
Header($type);