http://www.daniweb.com/forums/thread252440.html
gets me this error message
Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 3842759 bytes) in /home/daniweb/httpdocs/forums/includes/class_bbcode.php(172) : eval()'d code on line 150
I'm assuming the OP has pasted a bitmap (or some other stupid thing) into the message, rather than an attachment.