Cox SMTP / SSL

Cox has enabled SMTP over SSL and apparently is now allowing authenticated SMTP email from outside the Cox network.
Instructions are here.
Its a simple matter of changing the outgoing server port to 465 and checking the use SSL box. Additionally you need to enable authentication for SMTP (same credentials as POP3). Even from the Cox network, you must use authentication to send on port 465.
I dont really use the Cox email accounts for much. I primarily use my personal domains or my gmail account. While I’m not interested in sending Cox email while off network, I do like keeping the first hop of the messages journey encrypted. It would be nice if they offered opportunistic SSL/TLS if in addition to offering customers the chance to use SSL/TLS.
I wonder if they plan to implement DKIM now that Cox has provided the opportunity for customers to send email though Cox servers even when they are off network.