CS account holders automatically have their CS email address (which is forwarded to their Brown email or some other account of their choosing) automatically added to certain lists. This is a feature within the department to ensure that certain critical communications can be sent to these restricted lists. For example, the Syspost, Announce and Course lists are set to have users subscribed to them without the user's interaction. The result of which is that unsubscribing from these lists would require the user's CS account to be closed completely.
If you have tried unsubscribing from a list, but you are still receiving emails, first check to make sure that you are unsubscribing the email address that is listed in the "To:" field of the message. Most users find that they have registered both their CS and their Brown accounts on multiple lists and as such must unsubscribe both addresses in order to stop the incoming messages.
If you are sure you have unsubscribed the all corresponding email addresses and are still receiving mail, then you are likely being added back to that list automatically. In that case you would need to either close your CS account or set your mail delivery options to something more convenient for the list in question.
Alter/Mute Mail Delivery
If you log in to lists.cs.brown.edu and click the list you want to disable (mute) or alter delivery for, from the list of lists you are subscribed to on the left side of the page, you can then edit your Subscriber Options to set your Receiving Mode to "No Mail" or any of the other options in the dropdown menu.
NOTE: If you log in, but do not see the list you are trying to mute listed on the left side of the page, then you are most likely logged in using the wrong account/email. Check the "To:" field in the original message for the actual recipient address the message was sent to. @cs.brown.edu addresses are actually just email aliases that deliver to a designated inbox, which is usually an @brown.edu address.
Steps to mute a list you are subscribed to automatically:
Log in at lists.cs.brown.edu with the email address that is receiving the messages
Select to list from the list of lists on the left side of the page
Select Subscriber Options from the menu on the left side of the page
Choose "No Mail" from the drop down menu next to "Receiving Mode"
If you would like to close your CS account, have forgotten your password or continue to receive mail after following the steps above, please email firstname.lastname@example.org for further assistance.