Still in the 'Options' dialog, select 'Incoming Mail'

Fill in the fields as shown below:

Outgoing Mail Configuration

Select 'Sending Mail'

Fill in the fields as shown below:

SSL Configuration

Close the 'Options' dialog and click on the "Check Mail" icon on the button bar.

Eudora is not pre-configured to trust the Equifax SSL certificate that Neomailbox uses, so you will see the folowing error:

Click on 'Tools' in the menubar and select 'Options' again.

Select 'Checking Mail'.

Click the 'Last SSL Info' button.

Eudora pops up a dialog box:

Click the 'Certificate Information Manager' button.

Eudora pops up another dialog box:

Select the 'US, Equifax. Equifax Secure Certificate Authority' certificate from the 'Server Certificates' section, and click the 'Add To Trusted' button.

The Equifax Secure CA certificate should appear in the 'User Trusted Certificates' section, as below:

Click 'Done'.

Click 'OK'.

That's it. You should be able to send and receive mail now.