Both Signature and Encryption are meant to ensure mail transfer, but in a safe environment normally not mail storage. I know, there are good reasons to deem no environment as safe, but as an option to the user I'd like to let mails be permanently decrypted automaticaly, if
- they are marked as read
- they have GPG/SMIME based trust
If there are good reasons against doing so, or as another option, if additionally
- they are written by myself
The latter would remove the signature from all the mails in my Sent folder, which always leads to the paper clip appendix symbol. As a consequence I could directly see, which mail has an appendix.