[Mailman-Users] mailman, attachment and digital sign

[Marco De Rossi]

Hello, we have installed "Mailman, the GNU Mailing List Manager" version 
2.1.5
If we send a digital signed e-mail *with attachment* to a list we obtain 
the following message:

   Digital Signature Is Not Valid
   This message includes a digital signature, but the signature is 
   invalid.
   The signature does not match the message content correctly. The message 
   appears to have been altered after the sender signed it. You should not 
   trust the validity of this message until you verify its contents with 
   the sender.

Without attachment, digital sign is OK.

In the past we have had the same problem even send simply digital signed 
e-mail (without attachment), but in the past mailman was used to add a 
message footer in all e-mail.
We have modifed mailman so now it not add the message footer anymore.
Now we still have this problem only when we send digital signed e-mail 
*with attachment*.

Thanks.

   Marco De Rossi