strange problem

["Bob Bish" <bish @ azstarnet . com>]

   One listmember's address recently started bouncing list mail.  I've 
corresponded with him and all "regular" mail goes through.  He's on other 
mailing lists and is getting mail from those.  Only mail from this particular 
list seems to bounce.  No other listmembers are having this problem.
   The "bounce" messages give the following info:

gcg@mesh.net... Deferred: Name server: ns1.mesh.net.: host name lookup failure


   Apparently, lookup succeeds for "mesh.net", but not for "ns1.mesh.net".  I 
had the member forward this info to his sysadmin, but he said he had no idea 
why the list mail is bouncing.
   Any ideas?

...Bob