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S/MIME & Encryption with Cisco ESA not valid on Recipient

Hallo,

we want to use Cisco ESA C390 (installed latest ASyncOS 9.1.2-036) for S/MIME and De/Encryption Outgoing / Incoming Messages. We created S/MIME Profile and has harvest all needed public keys. We do all needed things documentated on admin guide, but now there are some problems, when outgoing content filter applys the sign und encrypt messages .

- Outgoing: Sender display name not show anymore the in Exchange configured simple displayname, it only displays the senders mail address

- Outgoing: S/MIME is attached in mail but in the recipients Outlook, there will be no Information of it (valid or invalid was not shown)

- Outgoing: If mail is encrypted with the public key of the recipient, the message will allready encrypted, but the user can't see the Body and allready the subject and recipient of the message will not show anymore

in Header u see this: "To: Undisclosed recipients:;"

I think the problem is, that the encrypted Mail is not formated correctly, because after encryption, there are 2 times the fileds from, to etc.

Here is the extract of Header Information:

Return-Path: <recipient@example.de>
X-Envelope-To: sender@demo.net
From: User Recipient <recipient@example.de>
To: "User Sender" <sender@demo.net>
Return-Path: recipient@example.de
MIME-Version: 1.0
Content-Disposition: attachment; filename="smime.p7m"
Content-Type: application/pkcs7-mime; smime-type=enveloped-data; name="smime.p7m"
From: <recipient@example.de>
To: Undisclosed recipients:;

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Any solution?

Any solution?