Thanks for the suggestion, Josh! I downloaded Graham's prot-spop3.reb and Gabriele's fsm.r (which I renamed fsm2.r as I couldn't find an fsm2.r - it seemed to work without error). It appears to be able to open two different POP3 mailboxes, but both of them show 0 messages even though I know they both have messages in them.
I guess you'll have to check with Graham. I believe he has said his protocols were completed
It looks like part of the problem I'm having with spop3 is that it doesn't throw up an error when there is no mail server on the other end, or if the settings are incorrect.
OK. So there is a bug with the ARM version of R3. I tried the Atronix latest branch and a version from 2013. Both had the same problem. Both always show that there are no messages in the mailbox when using any version of pop, spop, or imap. The exact same script with the exact same credentials on a version of R3 from Feb 2014 works fine on Windows.