> Message senders encrypt the message with the public key of the
> mailinglist. The mailinglist server decrypts the message using the
> private key for the mailinglist and encrypts it again individually
> for every recipient. The problematic part is the signature, I guess.
> Would it be possible to keep the original signature?

Sure, but you would need to ensure every tool sees the signature
and encryption as separate stages.  IIRC the PKCS7(?) standard
correctly, you can nest them so that instead of a "signed and 
encrypted" message you would have an "encrypted" message which 
contains a "signed" message.

But this comes back to the point Vadim raised - you need to
determine what the tools can support and work around that 
limitation.
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