Sign E-Mails with PGP and S/MIME

[JetstreamCC]

It is good to see that Stalwart supports PGP and S/MIME 🥳
But currently this is just used to encrypt messages at rest. It would be very nice to be able to upload the private key and sign E-Mails.
We have several automated processes that send mails through the server and don't include a signing feature. It would be nice to have this feature implemented in Stalwart, so we could for example send out our invoices as digitally signed mails to our customers.
This feature would also be helpful when using a webmail client, or basically any client, so we don't have to deal with the certificates on the client.

Please consider this, and keep up the good work 🙌

[mdecimus]

Hi, thanks for the suggestion but storing the user's private keys in the server is a security risk and for this reason such feature can't be considered.