1) Use GnuPG
2) Compose e-mail
3) Watch Claws-Mail save your e-mail IN PLAINTEXT to the server you have configured
4) Get your e-mail read by your e-mail provider
I am unable to find anywhere I can disable Claws-Mail from saving the e-mails being composed to the "Drafts" folder. This is a major security problem and makes Claws-Mail completely insecure when used with GnuPG.
Preferred behaviour would be to NEVER save your e-mails to "Drafts" when a GnuPG key is configured for an account. An alternative solution could be to save it as a message encrypted to yourself when saving to Drafts but I think the best thing to do would be to not save messages to Drafts. This could be a configuration option which is enabled by default if a GnuPG key is set.
There should probably be a configuration option to prevent it from saving anything to "Drafts" every even for non-GnuPG users.
GnuPG+Claws-Mail is to be considered unsecure and compromized with the current way it works.
After looking more I found
Preferences -> Compose -> Writing to disble "Save to drafts"
*** This bug has been marked as a duplicate of bug 2965 ***
(In reply to comment #0)
> GnuPG+Claws-Mail is to be considered unsecure and compromized with the
> current way it works.
That's nonsense, an overstatement at best.
You can use a Local queue and drafts folder in an MH mailbox, and besides, IMAP accounts are not the only kind of accounts.