Unsubscribing from FreeBSD mailing lists

I unsubscribed from several FreeBSD mailing lists, received unsubscribe confirmations, but the list mails continued to arrive for several lists (freebsd-doc, freebsd-arm, freebsd-wireless) anyway. I've now removed their email aliases which will stop them from my point of view.

Did I miss some step?
 
I haven't changed options in years, so I'm not sure if I'm correct, but I feel as if there was a confirmation email that I had to answer, or link I had to click, in order to confirm both subscribing and unsubscribing. Others probably can either correct or confirm this.
 
In theory a unsubscribe mail should be enough. Since some time this does not work anymore. It is necessary to visit the website where the mailing lists are managed and to unsubscribe there, too.
 
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