I am using eudora 5 and I wonder is it possible to have eudora automatically add
a line or two of text at the bottom of each message that I send out.

look under the tools menu and you should see signatures press enter on that and you
should be able to create a new signature. once you have done that, you have to go
to the options menu from the tools menu and then look for the composing mail and
there's a checkbox to check to see your signature while composing your emails.