T)opic scan of messages.  The "T" command reviews just the topic of
the messages.  It lists 3 columns of message numbers beside their
topics.  You can specify criteria for what messages to scan.  The
most common useful options are:

  S (or *) =  forward from where you last read (same as *)
  M        =  your mail specifically addressed to you
  xxxx-    =  backward from message number xxxx
  xxxx+    =  forward from message number xxxx
  <text>   =  only messages with <text> in the subject/to/from fields

Tips:  
1. You can jump to reading the message you want just by typing in the
numbers of the messages at the MORE prompt.

2. The S)can messages commands shows more information about each
messages.
