The SWI-Prolog mailinglist has been turned into a Google Group. The associated forum is embedded on this site. More details are here.

This action has been taken because DMARC policies enforced by Yahoo, but also used as indication of potential spam are not compatible with classical mailinglists that forward messages using From with the original poster. This caused many people to be unsubscribed due to bouncing mail as well as many people not receiving posts to the list due to spam filtering.

In addition, Google groups provide some useful extensions, such as a forum, tagging of messages, etc.