User support and communication happens in our case in the 4 following ways, listed in the order which we believe should be the most convenient for both our end-users and developers.
zamiacad-user mailing list: open list anyone can post to, which also keeps a searchable history of end-user discussions and requests.
bug tracker and feature requests tracker: open trackers for fine-grained dedicated requests anyone can post to. Code snippets, logs and file attachments fit perfectly here.
support [ a t] zamiacad [do t] com: direct e-mail to contact us if you want to talk to us in private or feel uncomfortable posting on the mailing list.
Feel free to choose whichever way suits you best!