I responded to a post with a somewhat lengty (15 lines?) of prose that I composed in the input window. When I submitted it I got the message "Sorry our spam filter is not available, please try resubmitting later." When I tried it again, I got an error message and my composition was gone. I really don't want to recreate it from scratch, so I will simply abandon it as a frustrated user.
Surely your system should be able to accept inputs to a holding area, to be qued for the spam check when it is available, instead of expecting the users to do this.