But you can learn a lot by reading select items here, and if you use a signature file, every time you post your opinion or helpful advice or relevant question, people see that you are an auction seller and see the link to get further information about what you have to sell. That's a way to spread the word without violating the culture. Either enter a query or click on a category, then a subcategory. Here you'll see brief descriptions of the topics and information on how to subscribe. Nowadays it is standard procedure that you first need to subscribe to a particular list before you can post a message to it.
Many lists also have moderators who filter the messages to make sure they are on topic.
Those lists that don't have moderators and automatically forward all messages received to the whole list, typically have a core of dedicated participants who quickly become outraged at inappropriate behavior, especially spam. In this case, the dialog takes place at a particular Web site and is saved there. The rules of engagement vary widely, depending on what the site owner is trying to do. Once again, it's usually best to restrict your commercial message to your signature file and keep the body of you messages strictly non-commercial and on topic. But the ones already in place should work quite well for most auction sellers.