-Early versions of POP3 (RFC1081, RFC1225) supported a crude form of
-independent authentication using the \fI.rhosts\fP file on the
-mailserver side. Under this RPOP variant, a fixed per-user ID
-equivalent to a password was sent in clear over a link to a reserved
-port, with the command RPOP rather than PASS to alert the server that it
-should do special checking. RPOP is supported by \fBfetchmail\fP
-(you can specify 'protocol RPOP' to have the program send 'RPOP'
-rather than 'PASS') but its use is strongly discouraged, and support
-will be removed from a future fetchmail version. This
-facility was vulnerable to spoofing and was withdrawn in RFC1460.
-.PP