Rob[atSound-Rehab]
and the post disappears if it disappeared before and you try to post it again ... some more hints on same content going through the filters in short time (which unfortunately all spam is about)
That's a good point. I've had posts that I edited shortly after posting do the disappearing act.
It makes sense is a way in that one characteristic of spam bots is they keep trying to post at high speed, so a spam detector is likely to regard such symptoms as indicative. Another sign of potential bot activity seems to be if the same account or IP address attempts a number of data entries in a short period.
The problem is that spam/abuse detectors are trying to use a technological approach to solve what is essentially a social problem - people wanting to disrupt, or insistant that everyone one the planet gets to see their spam all the time. Fighting the stuff has been an arms race since the mid 90s, and the moer effective the technology is at blocking stuff the more likely it is to also make false positives and decide genuine content is abuse.