Certain messages cause php3 to crash when being accessed via imap.  Both c-client 4.5 and 4.6.BETA from washington.edu compiled into php 3.0.12 produce the same result.

Please email me at online@olg.com if you need a test account with the message that causes this crash. 

Here is a backtrace to help you audit and debug the code:

(gdb) run -X -f /root/httpd/httpd.conf
Starting program:
/root/httpd/httpd.new -X -f /root/httpd/httpd.conf
 
Program received signal SIGSEGV, Segmentation fault.
0x80820a7 in imap_add_body (arg=0xbfffe83c, body=0x826d7f0)
    at functions/imap.c:2170
2170 body=body->CONTENT_MSG_BODY;
 
(gdb) backtrace
#0 0x80820a7 in imap_add_body (arg=0xbfffe83c, body=0x826d7f0)
    at functions/imap.c:2170
#1 0x8081ffd in imap_add_body (arg=0x81947d8, body=0x826d700)
    at functions/imap.c:2161
#2 0x8082229 in php3_imap_fetchstructure (ht=0x8266688,
    return_value=0x81947d8, list=0x8196b20, plist=0x8196ae0)
    at functions/imap.c:2213#3 0x80a3954 in phpparse () at control_structures_inline.h:934
#4 0x8065b88 in php3_parse (yyin=0x81dee50) at main.c:1553
#5 0x8065d50 in apache_php3_module_main (r=0x81c6e64, fd=19,
    display_source_mode=0, preprocessed=0) at main.c:1934
#6 0x8063409 in send_php3 ()
#7 0x806346a in send_parsed_php3 ()
#8 0x80afed3 in ap_invoke_handler ()
#9 0x80c2c19 in process_request_internal ()
#10 0x80c2c7c in ap_process_request ()
#11 0x80baa0e in child_main ()
#12 0x80bab9c in make_child ()
#13 0x80bacf9 in startup_children ()
#14 0x80bb316 in standalone_main ()
#15 0x80bba83 in main ()
#16 0x400fbcb3 in __libc_start_main (main=0x80bb75c <main>, argc=4,
    argv=0xbffffd34, init=0x804b9ec <_init>, fini=0x811af7c <_fini>,
    rtld_fini=0x4000a350 <_dl_fini>, stack_end=0xbffffd2c)
    at ../sysdeps/generic/libc-start.c:78