I'm new to Exim and I'm having a hard time figuring out this:

How can I tell Exim to accept mail to the address foo@example.com and deliver it to the local user foouser, which mail is stored in /var/mail/foouser in mbox format?

The domain is specified in /etc/exim4/update-exim4.conf.conf like this: dc_other_hostnames='example.com'

Debian version 7.5

Why would you pick the oh so obscure (and convoluted) Exim instead of PostFix?

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Either provide enough details for people to help, or sit back and listen to the crickets chirp.
Security thru obscurity is a myth - and really really annoying.

Using debian defaults is worth it sometimes... exim was a steep learning curve in the beginning. I have been there.
this link may help:
http://serverfault.com/questions/173104 ... tc-aliases
I use exim4(since lenny) along with sa-exim(spamassasin plugin) and it has worked _very_ well.

Thanks, Motohoss. That link led me to http://www.debian-administration.org/articles/140 which provided a good solution