After checking and re-checking, it seems I was wrong in thinking Postfix might 
be the problem. Somehow, I think I've broken Mailman to some extend. Let me 
elaborate: I was testing mailman by sending messages to the list owner. 
Nothing, the list owner didn't recieve them, and the sendmail queue was empty. 
I send a test message to the list. Nothing, the sendmail queue was still empty. 
Not knowing what else to do, I reboot the Linux server and try to start 
mailmanctl. It gives me the "stale pid" error so I start it with mailmanctl -s. 
So far, so good, I think. But still no message recieved. I check the logs, and 
nothing gives me a clue. Then I find this directory: /usr/local/mailmal/locks. 
When I do a ls, it gives me lots of .lock files with the name of my list. 
Deciding I had nothing to lose, I delete them all. Voilá, the list owner starts 
receiving mail I send 3 days ago and the sendmail queue starts to fill with the 
test message I send sever or eight hours ago! Tomorrow I'll send another test 
message (I'll wait for this to finish sending), but what I'd like to know, if 
someone actually has a clue, is what just did happen, or is happening, and more 
importantly, will it happen again? I think it has something to do with stale 
locks, but I can't be sure. So, if someone has an idea, please tell me.

P.D.: Forgive my english. It's not my first language and moreover, it's 03:44 
in the morning. Thank you all.
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