/$LISTNAME/f/$MESSAGE_ID -> 301 to .html version
/$LISTNAME/f/$MESSAGE_ID.txt -> 301 to m/$MESSAGE_ID.txt
/$LISTNAME/f/$MESSAGE_ID -> 301 to .html version
/$LISTNAME/f/$MESSAGE_ID.txt -> 301 to m/$MESSAGE_ID.txt
Maybe TODO (these might be expensive)
-------------------------------------
/$LISTNAME/t/$MESSAGE_ID.html -> HTML content of thread
Maybe TODO (these might be expensive)
-------------------------------------
/$LISTNAME/t/$MESSAGE_ID.html -> HTML content of thread