Parse dovecot 2.2 logs with logstash

Guys,

I need to parse my dovecot log files with logstash grok patterns. Is there any document specifying the patterns used by dovecot to write it's logs?

I need to find all the log possibilities that could be writed to log

files by dovecot. So, if a document like that exists or if anyone could answer my question, I'll could make the parser with less difficult.

-- Att. Bruno Galindro da Costa