>I think this should be a configurable option. In other words, I don't think it's a correct behavior to be restricted in posting messages depending on other person's will. But if this is the behavior Denis wants, he may have it as an option. For myself I would prefer the original behavior without any restrictions.

What was implemented is different than what was requested. Basically, it restricts it in the same way as if someone would try to send a private message to someone who doesn't want to be contacted by that person anymore. Everything is ok in there. No further changes are expected at this moment in regards to that point.