What rules???
Please, do no regard that as a sarcastic reply, simply a statement of fact unless things have changed.
I access this list via the gmane.org and were it not for that option, I wouldn't be subscribed.
I now follow 4 open source newsgroups (I'm calling the LO mailing list a newsgroup for this message, as that is how the gmane system formats the emails), and I sadly have to say all 4 are really poor and unfriendly systems to new users.
Not from the perspective of the majority of the people who try to help, but from the perspective of how the organizations have set up their websites when it comes to finding help if you are a new user to the product and/or a new user of newsgroups and mailing lists. Sort of like taking your car to the dealer, and no one is at the desk to schedule your repair. 
Sticking just to "the rules"...
When I first subscribed to this list, I got into a discussion with another user about netiquette, and just what the proper "rules" were. That prompted me to do a little poking around the web for netiquette rules.
To keep it short, some places tell you to top post, some bottom post, some say interspersed.
LO says .................*NOTHING!* I've not been able to find a page from TDF about netiquette. Until TDF actually develops a netiquette type of rules page or guidelines, then there is no right or wrong way. Just different ways. And those that say A is right and B, C, D, etc. is wrong are applying rules from a different organization to this organization.
Personally, I would prefer interspersed, it keeps the reply near the topic being replied to.