A warning to everyone, because this is something which has tripped me up in the past. Several people have been surprised to learn this, as I was, so it's good to clarify it to prevent anyone else suffering unintended consequences. If another member says to you "I don't want any more PM's from you, as they will be considered harassment," you can not PM that member again in any way, regardless of content, regardless of intent, regardless of provocation. If you do, you're banned from the site "temporarily"--the prescribed period seems to be about one year. This is not stated anywhere in the FAQ, and several people have told me that they would assume that sending another PM, sometime in the future, polite and civil, would not violate the rules at all. That's not true. So be aware that if anyone says that they don't want to receive any more PM's, you no longer have the right to address them privately at all, in any way. If they say things publicly that would seem to require a private response, you can't make that kind of response. It's a kind of nuclear option, unilateral, within the rules of this forum, and it's good to let everyone understand it clearly.