[imp] S/MIME decryption error

[D. Milanovic]

Hello,

I am unable to successfully decrypt S/MIME signed/encrypted message in
Horde. Sending is OK and message can be read in Thunderbird without
problems. However, error message "Could not decrypt S/MIME data." is
displayed when trying to read same message in Sent folder. Same error is
displayed for all incoming encrypted messages.
All certificates (personal and public) are imported without any errors.

No error messages in PHP or Horde log.
Horde version is 5.2.11, Imp version 6.2.11

Any help is appreciated.

Dan