Hi Andreas, My guess is that the emails are not encrypted by opaque signed. S/MIME signing supports two types of encoding: clear text and opaque. With opaque signed email you need a mail client which understands S/MIME signed email. Unfortunately some email clients like for example Outlook use opaque signing when the email is encrypted. After decryption the resulting email is therefore opaquely signed. If you mail client does not support S/MIME you will only see an attachment names smime.p7m.
You can configure the gateway to remove the signature by enabling the S/MIME advanced setting "Remove signature". This will then convert the smime.p7m attachment to a normal email. Unfortunately at the moment this will remove the signature from all S/MIME emails, i.e., also from the clear signed emails and not just from the opaque signed emails. Kind regards, Martijn Brinkers -- CipherMail email encryption Email encryption with support for S/MIME, OpenPGP, PDF Messenger and Webmail Messenger On Wed, 2021-02-24 at 09:48 +0000, Andreas Studenski via Users wrote: > Hi there, > > my problem exists for a longer period now. As more and more S/MIME > crypted mails are incoming, situation is getting annoying. > So I started solving the problem, unfortunately without success. > > I have internal domains (locality "internal") in ciphermail, S/MIME > certficates including private keys are successfully imported, mail > routing works, everything is running fine except one weird thing: > > When S/MIME crypted mails are incoming for my user they will be > decrypted by ciphermail. Logfile is showing "S/MIME message has been > decrypted." and "S/MIME signature was valid", but only crypted mails > are arriving in my inbox. > I have searched for ages now and checked the configuration many > times. Also reinstalled the server. Problem stays the same. > Ciphermail does not decrypt mails. > > Anybody knowing this problem? > Many thanks in advance. > > Andreas
