I called 1800-ATT-2020 and routed to U-Verse Technical Support.

I told then when I had lineshare DSL I had opted out of the port 25 block.

I converted to U-Verse Internet and there is no longer an option op-out

port 25 on the opt-out site.

I told Tech Support I had several NAS hardware devices that email

status messages on a regular basis and use port 25 and there is no

option in their config to override that port.

In about a minute the port 25 block was removed.

QED