[Dovecot] IMAP-Proxy and LDAP?

I am doing some research on Dovecots IMAP-Proxy features mentioned in <http://wiki.dovecot.org/HowTo/ImapProxy> and <http://wiki.dovecot.org/PasswordDatabase/ExtraFields/Proxy>.

The docs only mention SQL as backend to hold required data. Is it also possible to use LDAP?

TIA,

p@rick

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