How can we?

A friend of mine was about to sent them money ($300) for an n95!!
I knew immediately that it was a scam since I saw it here earlier.

I think, it is better not to delete (all of them at least) but write on them that it is a fraud..
The web is flooded with them and if you are unaware it is easily to get caught.

Ban their IP Address(s) from registering and/or posting?

In most forums (this one included) there is a button on every post to report it to the moderators. Here on ITT, it's the small triangle in the top right corner (on the default theme). You can click on it to report any inappropriate posts or spam.

Yeah, I believe we have done that. I, for one, have reported countless spam posts. If it is the same person, why not just ban the IP address?

Ever heard of dynamic IPs?

or proxies?

Is there some way that the little exclamation point/triangle flagging of messages can be excluded from the RSS reporting feed?

The sheer length of some of these posts seem to overwhelm the reader.

For this spam control, I have a suggestion:

Why can't this forum "self moderate" by utilizing this "Report post" button? My idea is that once enough (something like 3 or more) users "votes" for a post as spam/inappropriate, it would be removed automatically. Requiring this "more than one" report should prevent the misuse of this feature. And, if the "spam versus good posts ratio" of any user increase over 30% the user gets banned permanently. (Until moderator decides to remove the ban.)

Just today there was one new poster registered and he has already posted close to ten spam messages... I already reported couple of the posts and asked moderator to ban the user...

All these spammers are making me mad!

EDIT: Today's spammer posts have now been removed, than God...

I kind of like that idea of automatic (without waiting for the moderator) blocking posts from getting into the RSS feed if someone has clicked the Report Post button. No big disaster if it's wrongly tagged, but we would avoid getting these cases where one post may fill up the RSS feed with a long spam message (you know how it works with the tablet RSS version.. usually there won't be many current entries). I've set RSS for ITT to read in the whole posting, so that I can read something useful when offline. But reading a long list of offtopic items for sale isn't particularly funny, when it's at the cost of something useful.