[Evolution] .p7m attachment freezes Evolution

[mario chiari <ml mariochiari net>]

Hi 

I received a mail with a .pdf.p7m attached file.
Evolution does not show the usual icon of the attached file, and I am not able
to download it. 
I am not able to open any more any mail from the some folder. 

I tried cseveral time, and sometimes, after some time, Evolution shows the
underlying code of the file  (I may save it as a .mbox file) 

your help is welcome
cheers
mario