Issue with S/MIME decryption most likley caused by Exchange attaching corporate signatures

Looked good in first tests.
Thanks for helping out.

Best regards


On 04/20/2018 06:08 PM, Martijn Brinkers wrote:

Opaque signed are signed message but in encoded form and require a mail
client that supports S/MIME. Clear text signed messages can be read with
a non S/MIME aware mail client. Outlook opaquely signs a message before
encrypting it.

Can you check with a mail client that supports S/MIME (Thunderbird,
Outlook etc.) whether you can read the message?

If the message is opaquely signed, the "solution" is to have ciphermail
remove the signature. The result in then a normal message.