UUCP problem

[Jeffrey B. DeLeo]

Our site has two vaxes (thoth & silc) running ULTRIX.  They share
disks via NFS, and use Yellow Pages.  The directory /usr/spool/uucp is
on thoth.

The problem we have is that only one of the machines can communicate
to the outside world via UUCP :

Mailing to the following from thoth works properly :
	bunny!harvard!silc!jbd0

Mailing from silc with the same address results in :
	uux failed. code -1
	554 bunny!harvard!silc!jbd0... unknown mailer error 255

How can I fix this so mail will work properly from both machines?

		...!harvard!jbd0 at silc
			- or -
		...!bunny!thoth!jbd0