For example, our mail server, hermes, uses UUCP to transport email to my
-laptop, ulysses. Ulysses can poll hermes on TCP port 520 from anywhere
+laptop, ulysses. Ulysses can poll hermes on TCP port 540 from anywhere
on the net. This is independent of ulysses's IP address, and there's
no messing with SMTP/ETRN.