On boot, my SheevaPlug computer (running Ubuntu) emits this:

Starting MTA:eth0: link up, 100 Mb/s, full duplex, flow control disabled
Starting web server: lighttpd.
Starting network management services: snmpd.
Starting OpenBSD Secure Shell server: sshd.
 exim4.
ALERT: exim paniclog /var/log/exim4/paniclog has non-zero size, mail system possibly broken ... failed!
Debian GNU/Linux 6.0 sheeva ttyS0
sheeva login:

Looking in /var/log/exim4/paniclog, I see
2011-11-11 19:52:02 IPv6 socket creation failed: Address family not supported by protocol

I'm not using IPv6; I don't know exim. Any pointers on how to resolve this, aside from replacing exim?