cron'ed, at'ed, exim'ed user limits

[Pere Camps <pere@casal.upc.es>]

Hi!

	How can I set user resource limits a la /etc/limits for the
programs executed by cron, at and exim's .forward?

	This is to avoid possible DoS by massive resource grabbing by
untrusted users.

	Thanks in advance for your help.

-- p.