1. Incoming mail server = mail.yourdomain.??
2. Outgoing mail server (SMTP) = mail.yourdomain.?? (same as incoming mail server)

BEFORE

AFTER

Select More Settings

1. Select - The Outgoing Server tab
2. Tick - My outgoing server (SMTP) requires authentication
3. Select - Use same settings as my incoming mail server

1. Select the Advanced tab
2. Change Outgoing server (SMTP) port number to 587

1. Click OK
2. Click Next to test settings
3. Click Finish