[exim] SMTP data timeout

Hi,

I am getting the following messages in my exim4 mainlog

2006-11-01 20:43:44 1GfCYW-0001Rt-Np SMTP data timeout (message
abandoned) on connection from xxx.xxx.xxx.com [xxx.xx.xx.198]

What do I have to do to exim4 to increase the timeout allowance.

I have looked all over the config and cannot see anything that might
need to change.

Thanks and regards,
Chris.