[SAC] daily digest in greek fails to show

Dear all,

I have an urgent matter to resolve: while messages sent to the OSGeo Greek Chapter List (greek@lists.osgeo.org) in Greek are received correctly, messages received through the digest service of the listserv are being "destroyed" and show up as a series of "??".
I looked at it to make sure that the problem is not due to a client misconfiguration or something similar and I tend to believe that this is a listserv configuration issue, where Greek is not one of the available languages.
Is there any way to resolve or get around this?

Thanks in advance for your help,