Why does imapd get restarted at night?

[T. Ribbrock]

Hi all,

as I just noticed, imapd seems to restart every night at 0:00h. This is
a bit annoying, as all clients have to reconnect, hence, I was trying to
find out where (and maybe why) this is happening. I can see it's done in
rc.imapd and seems to have something to do with rotating the logs.
However, other Linux installations don't seem to have the need to restart
imapd just to rotate the logs - why does Kolab?

Cheerio,

Thomas