external procedure from trigger?

I would like it if I can set up e-mail through a trigger, and therefore paging. I have an error table in a custom app and was hoping to be paged whenever there was a new
record. (Paging is done through e-mail in my case). I thought an external
procedure which called a shell function or os command would do the trick,
but it occurred to me that since there's no dbms_sql allowed, there may be no external procedures allowed either in triggers. If this is true, any other ideas?
I saw a posting ealier about mucking around on Oracle's website for help with e-mail.
Possible in a trigger? I guess I'm just thinking that if there is some sort of theoretical
problem with committing in a trigger, it might be a problem to interface with the outside
world as well.

• Dc.