[Exim] Use of file's atime stat.

Hiyas All,
I'm currently trying to do some performance tuning of exim, I've been reading
a lot about mounting filesystems with the noatime option, and I was wondering
if exim use the atime stat on a file for anything apart from the appendfile
transport? I've done a recursive grep through the exim-3.35 source for atime
and the only mention of it i can find is in appendfile.c, Have I missed
anything major, or am i safe to mount my input spool with the noatime option?

Thanks for your help,

Colin Morey