exim lookups
From WebHostingNeeds.com
exim -bV | grep Lookups
Shows exim Lookups.
If you need MySQL based virtual email hosting, you need to check if mysql is listed in Lookups
Following is for standard exim installed on CentOS 5 with yum, it seems mysql is supported by default.
# exim -bV | grep Lookups Lookups: lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmnz dnsdb dsearch ldap ldapdn ldapm mysql nis nis0 nisplus passwd pgsql sqlite #