if you are looking for a solution with only one entry in /etc/passwd you can
use vpopmail (http://www.vpopmail.cx)
-> 1 entry in /etc/passwd - everything runs under a single UID/GID
-> Support for Oracle, Sybase, Mysql, LDAP, /etc/passwd, /etc/shadow and
default cdb authentication storage
etc.
for more features, have a look at their page.

cya
Joel

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