This article will give you a step by step guide on how to turn on SMTP authentication on your account in Opera.
1) Open Opera
2) Click the “Menu” button on the top left of the screen and select “Mail and Chat Accounts…”
3) Select your account and click “Edit…”
4) Click the “Outgoing” tab
5) Check the box that says “Queue messages (do not send immediately)”
6) Check the next box that says “Send queued e-mail after checking e-mail”
7) Click OK
This concludes how to turn on SMTP authentication on Opera