I just set up a second email in my new emclient app. The second email I have made default. It receives fine. But when I go to create a new email to send, the send from options at the top do not include the second, new email, only the first email created. I do not see anything missing in the account setup, but there must be something missing, but what? Right now I am on the free license, but will upgrade to paid if I settle in with this app.
If it is a Microsoft hosted account, like Outlook.com, Hotmail, Live etc. it is because the AirSync service is not selected.
Go to Menu > Accounts and click on the General tab for the account. Scroll down to Services and tick AirSync, then click on Save & Close.