Any post made by you within the 24 hour gap of your last post is considered a bump that is not allowed.
You will 100% be infracted for such action.
If you want to message buyers, either VM/PM them or add them on Skype. There is a reason why these features are available on MPGH.
Now you're gonna ask why we'd infract you for that. It gives you the upperhand with bumps, being able to keep your thread at the top if you answer questions or say you're in stock every hour or so.