Sometimes when I create an e-mail message in the Windows 10 Mail app and send it (it is a gmail account) it sends fine. Other times I click send and it seems like it sent but in fact, the e-mail vanished. It did not send, it is not in the outbox, it is not in drafts. It just disappeared.
I can't figure out why some e-mails send and others disappear.
How can I get all e-mails to send reliably?