At 19:54 02/26/2003 Wednesday, Ben Parker wrote:
 >On Wed, 26 Feb 2003 13:01:33 -0500, Jan A Bergeron VMD <[log in to unmask]>
 >wrote:
 >
 >>                  Last error: Unavailable; DSN status was 5.1.2
 >
 >>From RFC 1983:
 >
 >       5.1.2   Bad destination system address

For your bookmarks:

ftp://ftp.isi.edu/in-notes/rfc1893.txt