>>>>> In <b4mek56yha1.fsf@jpl.org> Katsumi Yamaoka wrote:

> In addition, `pop3-open-server' should also recognize a string
> as a port number.  See the `mail-sources' variable.  I use "110"
> for it, which causes an error.

I realized it depends on the platform whether
`open-network-stream' allows a string which specifies a port
*number* for the fourth argument.  For instance, both of the
following two forms work in the Fedora Core 4 system:

(delete-process
 (open-network-stream "POP" (current-buffer) "popserver" 110))

(delete-process
 (open-network-stream "POP" (current-buffer) "popserver" "110"))

However, in the Solaris 2.6 system, the latter form cannot be
used.  When we use a string for the fourth argument, it should
be a service name like "pop3".  This suggests that we should use
only an integer for a port number or a string for a service name.

But now I use "110", not 110 in the Fedora Core 4 system.  It is
because it should work with all the Emacsen that Gnus supports,
and XEmacs 21.4.17 which I'd built in the Fedora Core 4 system
doesn't allow an integer for the fourth argument of
`open-network-stream'.  It is obviously a bug, I found right now
thanks to some Japanese folks.

Finally, I replace the patch that I sent last with this: