I forgot to mention, you can sort your messages by clicking the Heading at
the top of any column and sort by the contents of that column. So, if you
have the FROM column as one of those that is visible, then you can click the
column heading and the posts will be sorted by the Original Poster, then you
can scroll the list to your name to find the posts you originated, and then
view any responses you might have received.

A shortcoming of this is that the Orignator of discussions is the way the
sort works, so if you are a respondant, you can't find your posts this way.
If you are an originator, the reply will all be in Date order.