S/Mime encryption issue

Mail
1

I have an S/MIME issue both in version 7 and 8.

Version 7.2.37929.0
Version 8.0.3385 (83a873c)

My E-Mail for example is [email protected] and the receipients adress is [email protected]
With [email protected] i use emclient. When i send an e-mail to [email protected] the e-mail
is encrypted with the s/mime certificate for [email protected] an not for [email protected].
So, [email protected] received this e-mail with .p7m attachement.
When [email protected] (not emclient) send an e-mail to [email protected], the e-mail is correkt
encrypted with the public key for [email protected].

When i send an e-mail from aa.aa.com to [email protected] with my Smartphone E-Mail Client
and the same Certificates, [email protected] receives this e-mail correctly encrypted.

Any ideas ?

2

How do you know which public key was used?

Yes, if the message is encrypted, the receiver will get it as a blank message with an attachment, something like encrypted.eml.p7m

3

When i open the sent e-Mail, there is a line with the information that the email was signed und encrypted. When i click on “encrypted” a pop shows that it is the certificate from the sender ([email protected]).
The encryption Mailgateway log, in front of [email protected], shows, that the email is not using the public key for [email protected] and this ends correctly in a blank p7m Mail.

4

Yes, because you don’t have access the private key for bb, there has to be some way for you to read your own sent messages. They will be additionally protected by the aa private key so you can open them yourself.

But it is encrypted using bb’s public key, and bb will need to enter the own password to view the message.

5

Thank you for the explanation on the sent e-mail.
But, the Mail-Gateway from [email protected] says that the E-mail is not encrypted with the public key for [email protected]. In the p7m file are some readable informations. One of it shows only certificate informations from [email protected]. So i think that the e-mail was not encrypted with the correct certificate.

6

Gary, thank you very much for your help.
I cant fix this issue, with Thunderbird [email protected] received my mail correct. I dont have a pro license and dont want to buy one. The new Calendar UI in Version 8 forces me to use a different calendar. em client is now complete useless for me.