I noticed this morning that e-mail sent from my Galaxy S8 Plus was not being delivered, even though the e-mails were showing in my Sent folder. I deleted the account in question from the app, re-added it, and rebooted the phone. Now, everything in the Sent and Trash folders have disappeared. The Inbox appears to be intact, but the problem still exists. There is an e-mail in that sent batch I really need to access. Any thoughts?