ZAPoly has a mailing list. The mailing list has been hosted on yahoogroups since its inception in 2005. Yahoo has been slowly collapsing like a forgotten flan in a cupboard and the group functionality has been broken more often than not recently so we have migrated the mailing list to a new platform - groups.io
Check it out :
https://groups.io/g/zapoly If you want to join, you will need to answer a few questions about your interest in polyamory.