E-Mail blocked, key not found - PGP Desktop / Symantec Encryption Desktop
we are using a PGP Universal Server (now Symantec Encryption Server) - Version 3.3.1 - Build 13100 - which is dropped into the mailflow and is doing e-mail ancryption and decryption for us.
A couple of days ago a customer reported that he cannot encrypt e-mails to us with the keys our server created (in SKM). In order to reproduce the problem I have downloaded "Symantec Encryption Desktop", created a key for a testing e-mail address.
Whenever I try to force encrypt an e-mail to this test account (by adding [PGP] to the subject) with the created key I get a message stating that the e-mail was blocked because no key could be found.
This does not work wether the key is added to the local keyring (signed and trusted) or retrieving via LDAP through our keyserver. Using LDAP the software even finds and downloads a key and then the log states that the key is not usable for encryption.
I have tried using different ciphers and hash algorithms and have checked the key properties, which includes "PGP Messaging". Still to no avail...
This seems to work fine with alternate PGP products as some of our customers are using these keys without problem. This issue just seems to exist with Symantec's Desktop software.
If anyone can point me in the right direction I would be more than happy...