Hi
To unsubscribe please send an email to the special address;
users+unsubscribe@global.libreoffice.org
Note that many email clients change that from a clickable link to an edited
one that doesn't work. It needs you to make sure the bit before the plus
sign and the bit afterwards are both included.
It doesn't matter what, if anything, you put in the subject-line or the
message as neither gets read by the automated system.
Full instructions are on the official website on this page;
http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/
Good luck and regards from
Tom