I am sorry - I am circumventing things right now, delete/move/purge this entry as needed.

As the subject states - I would be very interested in a "contender" in regards to safe file transfer - and adding it on onto GPGTools with GPG as a startingpoint would be awesome. I've had a wish for creating my own project for ages, but I am not clever enough for coding.

In short - here's my proposal/suggestion;
Create a action policy chain for how emails are handled.
I'll break it down.

If user presses sign - no further action - the sign process is performed as it is now.
If user presses sign/andor encrypt - the encryption process splits;
Key found - No attachments over X - email securely signed and encrypted, and sent.
Key found - Attachments over X ? Attachment replace with LINK
Key not found - either - Prompt user - can't do this - OR - sign up user with LINK

I have an old post stating my old but yet valid intentions;

https://ewook.fluffis.se/?p=1345

Anyone up to aid me in this?

To give you a better overview -
We have for example - mailcow for pure mailserver + roundcube that words and uses roundcube - that can use and incorporate PGP/GPG-keys.
We have owncloud, that does all things files in a half decent way.

I need your help - and I need GPGTool ;).