The answer to this question is a little more complicated than one might think.
First and foremost, PBS is not a newsletter in the traditional sense. It is a television network that airs programs that are typically 30 minutes long.
Secondly, although it does not fit into the traditional definition of a newsletter, PBS does distribute short e-mails to its subscribers on occasion. These e-mails usually contain information about upcoming programs or special events.
Overall, while PBS is not strictly a newsletter, it does distribute short e-mails to its subscribers on occasion, which would make it fall into that category.