Varbūt šis ir pie vainas - "If you need to use ACL and other features you may need to install exim4-daemon-heavy" 
Citāts:lightweight Exim MTA (v4) daemon. Exim (v4) is a mail transport agent. This package contains the exim4 daemon with only basic features enabled.
So, if you want 'clever' authentication, use the 'heavy' version; also,
if you want to integrate virus- and spam-scanning directly into the MTA,
you'll need 'heavy'. Note that you can always trigger, say, clamav and
spamassassin from procmail instead, still allowing you to use the
'light' version.
"Kā cilvēks, kam trūkst pašcieņas, nav dīdzējs, bet nīcējs, tā arī tauta, kurai nav pašapziņas." K.Mīlenbahs