After you have sent a response to an advertisement, you will no longer receive a copy of it in your own mailbox. You can still respond on advertisements as usual, but you will no longer receive a copy of it. You can assume that the response will be sent.
Note: Sexjobs does not have an internal message server. All correspondence goes through your own mail servers. This means e-mail traffic is directly between advertiser and visitor and not through Sexjobs. We don't see any reactions and can therefore not stop or forward them.