SELinux newbie

[Sietjp]

Hi all,
Sorry for this newbie post.
I'm running fedora 8 and lamp.
All is wroking fine except of emails. Apache is not able to send emails via
sendmail.

I tried setenforce 0, and then all is working fine.

But as I'm not a lazy guy, I would like to keep SELInux active and understand
what is giong wrong.

Please help :)
I don't ask for the solution but maybe a starting point or a link, thx :)

JP