Step 7
On the Accounts windows, select the correct account. To check SMTP settings, click on the symbol on the far-right of the Outbound Mail Server (SMTP) (circled below). Pick Edit SMTP Server List from the menu that pops up.
Check that the Use SSL box is ticked.
If you think you have some mail folders missing, then you may need to set the IMAP Path Prefix to mail/, but in general this should be avoided (it will only be necessary on older NetManager installs.
Click OK and close the Internet Accounts window. Go to the next step to resolve sending issues.