Please sync the Drafts folder from Exchange Online into Front, into Drafts. (Same as you do for other folders in an Exchange Online mailbox).
For context: Sage 200 accounting software generates emails into Drafts of a user's mailbox. User then has to launch Outlook (or use Outlook Web) just to hit 'Send' on these emails.
It would be more efficient to remove the need to launch Outlook by having the content of Exchange Online Drafts folder synced into in Front Drafts.