Address[] senders = msg.getFrom();
Address[] receivers = msg.getAllRecipients();
// Try first the recipients' private key
for (int i = 0; i < senders.length + receivers.length; i++) {
Address address = (i < senders.length)?
senders[i] : receivers[i-senders.length];
Key[] keys = encManager.getPrivateKeysForAddress(
((InternetAddress) address).getAddress(),
getEncryptionType(),