Problem about Postfix/Cyrus-imap/Mysql/Virtual domains

[Kai]

Hi,list.
 I am a newbie.
 I am using Cyrus-imapd-2.2.0 and postfix 2.0.7. I dont know how to let my
postfix lookups virtual domain  in Mysql.And I sent the question to
postfix's maillinglist,but nobody replied me.Would someone give me a sample
of postfix' configuration about virtual domain?
 Thanx!
---
Kai


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