Last Uses and Legacy
One surviving feature of UUCP is the chat file format, largely inherited by the expect software package.
UUCP was in use over special-purpose high cost links (e.g. marine satellite links) long after its disappearance elsewhere, and still remains in legacy use.
In the mid 2000s, UUCP over TCP/IP (often encrypted, using the SSH protocol) was proposed for use when a computer does not have any fixed IP addresses but is still willing to run a standard mail transfer agent (MTA) like Sendmail or Postfix.
Bang paths are still in use within the Usenet network, though not for routing; they are used to record the nodes through which a message has passed, rather than to direct where it will go next.
"Bang path" is also used as an expression for any explicitly specified routing path between network hosts. That usage is not necessarily limited to UUCP, IP routing, email messaging, or Usenet.
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