I have started contributing in GNU Mailman for quite some time now and a some 
Introduction is required so.
My name is Aaryan Bhagat a 2nd Year Computer Science Undergraduate studying in 
Indian Institute of Technology Kharagur.

github-link---"https://github.com/berserker1";
gitlab-link----"https://gitlab.com/berserker1?nav_source=navbar";

I will be focusing on the project idea "Add support for bounce processing in 
Core". I feel comfortable in this area and have undertook some research in this 
also meanwhile.


DISCUSSION FOR THE IDEA----------------------------------

Currently I have read the source code regarding bounce runner and various 
files. What I have gathered of all the bounce configuration files is this 
(Summary below if you want to skip) :

>File `bounce.py` in `mailman/src/mailman/interfaces` is an interface file 
>which defines various class of bounce functions.

>File `bounce.py` in `mailman/src/mailman/model` is a model file for various 
>functions.

>File `bounce.py` in `mailman/src/mailman/runners/bounce.py` runs the `bounce 
>runner` info read about the runners in the docs.

>File `bounces.rst` in `mailman/src/mailman/app/docs/bounces.rst` shows how a 
>bounce message is generated and send to the original sender , how you can also 
>send the error reasons in a dict and it will all be showed to the sender in an 
>organized way.

>File `bounce.rst` in `mailman/src/mailman/model/docs`  shows how a bounce 
>event is registered , it stores various info .  

>File `test_bounces.py` in `mailman/src/mailman/app/tests` tests the 
>`app.bounces` functions.

>File `test_bounce.py` in `mailman/src/mailman/model/tests` tests the `bounce 
>model objects` .

>File `test_bounce.py` in `mailman/src/mailman/runners/tests` tests the `bounce 
>runners`.

SUMMARY-------
What I can summarize is the method of detecting bounces, registering events, 
sending mail bounce message to the sender and all other data gathering events 
are complete.(Also mentioned in the proposal but I had to go though to 
understand the code otherwise I could not move on).

I have also read the Mailman 2.1.xx method of processing bounce addresses. 
Important docs I have read -----

Bounces in mailman3 ------------ 
"https://mailman.readthedocs.io/en/latest/src/mailman/model/docs/bounce.html";

Bounce Processing of Mailman 2.1( Sub topic here ) ---------- 
"https://wiki.list.org/DOC/Mailman%202.1%20List%20Administrators%20Manual?highlight=%28Bounce%29";

Runners in Mailman3 ------------------------ 
"https://mailman.readthedocs.io/en/latest/src/mailman/runners/docs/incoming.html";


QUESTIONS

Q1--- What should be my implementation of processing bounces? Same as previous 
Mailman or some new ideas.
         (I am researching this but also need pointers from other contributors!)

Q2--- Some crucial info I missed or overlooked please point out and guide me in 
the right direction for this. If any imp doc I missed please share the link.

I believe implementation on this is not trivial and suitable amount of 
discussion is required for making anything final.
I hope to contribute to this org as long as possible(GSoC or No GSoC). It has 
really sparked my interest.
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