anchors:
#u location of $MESSAGE_ID in URL
#m<SHA-1> per-message links, where <SHA-1> is of the Message-ID
of each message (stable)
#s<NUM> relative numeric position of message in thread (unstable)
anchors:
#u location of $MESSAGE_ID in URL
#m<SHA-1> per-message links, where <SHA-1> is of the Message-ID
of each message (stable)
#s<NUM> relative numeric position of message in thread (unstable)