using exim4 w/ Hardy and/or Intrepid

[Rashkae]

Robert Holtzman wrote:
> Just installed rkhunter and exim4 automatically tagged along. A post 
> here some time ago informed me that Ubuntu doesn't use an MTA but I 
> think I'd like to try running everything thru exim4 so I can call 
> spamassassin from it. Now I'm running fetchmail and delivering to 
> procmail and it shows up in ~/mail. How that happens w/o an MTA is 
> beyond me (if anyone can point me to a lucid explanation of that I would 
> be grateful). I suspect the answer is to simply have fetchmail deliver 
> to exim4 and I *think* exim4 will automatically pass it to 
> procmail....but I'm not sure.
> 
> I've never played with this before, always accepting the distro's 
> default. I haven't been able to find any docs pertaining to this 
> specifically. Anyone have any pointers, sources, flames, etc?
> 

Procmail is an MDA (Mail Delivery Agent), the MDA's job is to deliver
e-mail into a user's inbox on the local system.  MTA is only needed if
the mail needs to be transfered to another host.

However, most common (if not all) MTA's, including Sendmail, Exim and
Postfix, act as the system MDA as well (unless they are specifially
configured to hand mail to Procmail.  I believe that can also be done on
 a per user basis with .forward file)

A google search of "Exim spamassassin" should yield good results for
finding out how to configure exim to filter messages through spamassasin.