Mailing list

Mailing lists are very useful communication and coordination tool. FSCI provides mailing lists to Free Libre Open Source (FLOSS) groups and non profit organizations. If you want to open a new public list, please drop a mail at postmaster(at)lists.fsci.org.in.

Environment

Machine Summary

We are on scaleway virtual cloud server.

* Cores	: 2 x86 cores
* Memory	: 2GB
* Disk	: 50GB
* OS	: Debian GNU/Linux
* Web Server	: Nginx
* List manager	: Mailman3
* Spam Filter	: Rspamd
* Host name	: lists.fsci.org.in

Coordination

• Hangout with us in our Matrix room #mailman:poddery.com
• issue tracker - we use this to track progress of tasks

Admins

Abhijith PA, Prinz Piuz, Balasankar C

Admin Documentation

Generate DKIM for new domains

We use 'opendkim'[1] to implement DKIM. To generate DKIM keys, use opendkim-genkey -b 4096 -h rsa-sha256 -r -s <selector_name> -d <domain_name_of_this_list> -v`
We don't have any format on selector naming. Pick something related to this list(for eg: the selector for the domain lists.fsci.org.in is lists what we used). After generating the DKIM keys, we will get two files.

• <selector_name>.private - which contains the private signing key.
• <selector_name>.txt - which contains the DKIM TXT DNS record for that domain.

Now, create a folder under /etc/opendkim/keys/<domain_name_for_this_list>/ and move the above file to that location.
Create an entry for the newly created domain in /etc/opendkim/KeyTable as well as /etc/opendkim/SigningTable
On /etc/opendkim/KeyTable

<selector_name._domainkey.<domain_name_of_this_list> <domain_name_of_this_list>:<selector_name>:/etc/opendkim/keys/<domain_name_of_this_list>/<selector_name>.private
eg: lists._domainkey.lists.fsci.org.in lists.fsci.org.in:lists:/etc/opendkim/lists.private

On /etc/opendkim/SigningTable

<domain_name_of_this_list> <selector_name>._domainkey.<domain_name_of_this_list>
eg: lists.fsci.org.in lists._domainkey.lists.fsci.org.in

More on DKIM keys, formating etc: [DomainKeys Identified Mail], Setup DKIM with OpenDKIM on Debian: [How To Install and Configure DKIM with Postfix on Debian]

Verify DKIM and other settings for new domains

Create a text file, dkim-test.txt (replace To address with random address generated by https://dkimvalidator.com or https://www.mail-tester.com/)

From: "Test" <test-dkim@mm.gnu.org.in>
To: <random-address>@dkimvalidator.com
Subject: Testing DKIM and other settings for this domain
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

This email is to test email settings for a domain is correct

and use sendmail command to send it

/usr/sbin/sendmail -t < dkim-test.txt

Remove spam confirmation requests

Too many pending subscription requests can slow down[2] list index. Updating postorius is how to fix this. But in case there's no other way, and removing those requests through frontend [3] is impossible, this can be done (GNU Mailman 3.2.2 (La Villa Strangiato)):

$ sudo mailman shell -l listname.lists.fsci.org.in
Welcome to the GNU Mailman shell
The variable 'm' is the listname@lists.fsci.org.in mailing list
>>> from zope.component import getUtility
>>> from mailman.interfaces.pending import IPendings
>>> pendings = getUtility(IPendings)
>>> plist = []
>>> for p in pendings.find(m):
...   plist.append(p)
... 
>>> len(plist)
2047
>>> # Let us save the spammer email and when they signed up for analysis
>>> import csv
>>> with open('spam.csv', 'w', newline=) as csvfile:
...     spamwriter = csv.writer(csvfile, delimiter=',')
...     for p in plist:
...         spammer = p[1]
...         spamwriter.writerow([spammer.get('email'), spammer.get('when'), spammer.get('display_name')])
...
>>> # Now on to actually removing spam
>>> from mailman.interfaces.workflow import IWorkflowStateManager
>>> workflow = getUtility(IWorkflowStateManager)
>>> for p in plist:
...     token = p[0]
...     pendings.confirm(token)
...     workflow.discard(token)
...
>>> # Now, we have to commit this transaction to database
>>> from mailman.config import config
>>> config.db.commit()

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