local_scan is crashing on big messages

My uncle is trying to send me two emails with vacation pictures, and 
it's crashing sa-exim.

I'm running Exim 4.32, SA-Exim 4.0, and SpamAssassin 2.63.  I have 
sa-exim.c compiled directly into my Exim mail server; I'm not using it 
as a dynamic module.

Exim's 'mainlog' shows these messages:

2004-05-13 03:42:18 HXN6Q2-000I42-2K local_scan() function crashed with 
signal 11 - message temporarily rejected (size 2402302)
2004-05-13 04:06:39 HXN7UG-000I46-P6 local_scan() function crashed with 
signal 11 - message temporarily rejected (size 3363716)
2004-05-13 04:45:02 HXN9MG-000I4D-K3 local_scan() function crashed with 
signal 11 - message temporarily rejected (size 3363716)
2004-05-13 04:54:47 HXNA2V-000I4H-FT local_scan() function crashed with 
signal 11 - message temporarily rejected (size 2402302)
2004-05-13 05:28:57 HXNBNT-000I4K-KI local_scan() function crashed with 
signal 11 - message temporarily rejected (size 2402302)
2004-05-13 06:06:33 HXNDEB-000I58-BC local_scan() function crashed with 
signal 11 - message temporarily rejected (size 3363716)
2004-05-13 06:32:06 HXNEL2-000I5B-1V local_scan() function crashed with 
signal 11 - message temporarily rejected (size 2402302)
2004-05-13 07:07:13 HXNG7G-000I5G-15 local_scan() function crashed with 
signal 11 - message temporarily rejected (size 3363716)
2004-05-13 07:33:54 HXNHG2-000I5M-NF local_scan() function crashed with 
signal 11 - message temporarily rejected (size 2402302)

And so on and so forth. I'm guessing that 2402302 and 3363716 are the 
sizes of the two emails.

Is this a known problem, a config issue, or can I provide any 
additional debugging info?

   - B