Hi,
i wrote a program destination (in python) that parse a message and insert data in redis.

My code is:
import re
import fileinput
import redis

r = redis.Redis(host="127.0.0.1", port=6379, db=0)

for line in fileinput.input():
    tid = re.search('X-TransactionId: (.+?) ', line)
    #print tid.group(1)
    regexp_result = re.findall(" Recipient: ([A-z0-9._%+-]+@[A-z0-9.-]+)", line)
    for email in regexp_result:
        r.sadd(tid.group(1)+"_recs", email)

I configure my destination in this way:
destination python_to_file {
    program("/usr/bin/python /etc/syslog-ng/python/Ric_acc_dest.py" flush-lines(1));
};

It works only if i send many message. If i send only one message it doesn't insert nothing in redis.

Any ideas?