The mailing list for listmasters using Sympa

["José Manuel Bobba Ares" <address@concealed>]

Hello!! I have a problem; I want to make statistics with sympa, this is, when some mail is posted, I want to store some info in  new database, let's say "statistics".
I want to store for example: 
1) timestamp of post
2) IDmessage
3) IDuser
4) textmessage
5) # of subscriber in the list at this moment.

I don't know how to interact with sympa in this way! 
I read in the manual the "Sympa commands" section, and for the 5) item I saw this :

http://my.server/wws/subscriber_count/mylist returns the number of members of "mylist".
I try and it works fine, but via web only, I need to use tha in a .pl file for using in a script.
Another issue is where to put the script for acting like a "trigger" for outgoing emails.

If anyone can help, I'll be very thankful

Cheers, Jose