Apologies if the search engine has failed me here, but I don't see a way to cause welcome messages to be sent already closed; that is, to prevent replies. I see lots of posts about how to send the messages from a system user, to hide notifications, etc., but I'd simply prefer it be impossible to reply to such messages.
My forum is a software support forum, and I don't want to create the expectation that replies to the welcome PM are a means to obtain that support. (The text of the message itself asks users not to attempt that, but...)
Any thoughts? Thanks in advance.