[Exim] People thinking port 25 is a web server

Is there an easy way to immediately drop people from doing this:
2003-03-08 07:33:53 SMTP syntax error in "POST / HTTP/1.0" H=[199.243.131.42]: unrecognized command
2003-03-08 07:33:53 SMTP syntax error in "Via: 1.0 TANGO" H=[199.243.131.42]: unrecognized command
2003-03-08 07:33:53 SMTP syntax error in "Host: 216.98.66.34:25" H=[199.243.131.42]: unrecognized command
2003-03-08 07:33:53 SMTP syntax error in "Content-length: 8253" H=[199.243.131.42]: unrecognized command
2003-03-08 07:33:53 SMTP syntax error in "Content-type: application/x-www-form-urlencoded" H=[199.243.131.42]: unrecognized command
2003-03-08 07:33:53 SMTP syntax error in "Connection: Keep-Alive" H=[199.243.131.42]: unrecognized command
2003-03-08 07:33:53 SMTP call from [199.243.131.42] dropped: too many unrecognized commands

I was thinking of modifying the smtp commands to add POST as a "quit" option
that ignores parameters

I'm currently using exim 3.35. I'd like to know if it's doable at all (any
version upto and including the latest)