I suggest to install the following alternative email cient. “K-9 Mail”. It allows you to use the “Share” functionality and, therefore, add a task in DGT GTD. Let me know if that helps you.
An error occurred while saving the commentberthold commented
K-9 can't use exchange mail accounts, so it's not a suggestion for me. Please a pull-function to fetch all Mails in the inbox of a mail-account