Sentence 1: Finally, end your day by wandering back across the palace gardens for a last view of the chateau at sunset.

Sentence 2: You can't see the chateau at all at sunset.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: The listserv I'm on--subscribe by sending the message sub politics [your name] to listserv@aloo.netaxs.com--has not yet focused on the campaign, but will as Iowa and New Hampshire beckon.

Sentence 2: YOu can't subscribe to a listserv.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: DirecPC beams the Internet from Hughes' satellites to personal dishes and then into users' computers.

Sentence 2: DirecPC is the fastest source for receiving internet from Hughes' satellites.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell