We purged all these messages, so you may have gotten an email notification of a new message, but its now missing because we banned and deleted the content from both sending users. We received over twenty reports before taking measures. Thank you everyone and sorry for this. We try and do a good job by incorporating anti-SPAM methods for prevention.
The board stays clean as we approve all new member content once, but messages can get through. One change we made this morning was to prevent the amount of messaged that can be sent per day, which for now is 10. This will hopefully prevent widespread abuse like this over the last 24 hours.