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No route to host - mail error

 
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Old 07-23-2012
No route to host - mail error
A linux box is supposed to emailing the results of backups to the windows exchange server, but nothing arrives. it never has, as the muppet who set up the Windows domain knew nothing about linux. I know only slightly more than that...

pretty sure sendmail is the daemon running to handle mail. it shows in ps -elf.
/var/mail/maillog contains the same general line, repeating:

Code:
sendmail[3893]: q6I6gwfs011345: to=<username@live-domain.com.au>, ctladdr=<root@linux.live-domain.com.au> (0/0), delay=4+22:59:07, xdelay=00:00:00, mailer=esmtp, pri=10830308, relay=mail.live-domain.com.au., dsn=4.0.0, stat=Deferred: mail.live-domain.com.au.: No route to host

mail.live-domain.com.au is the external MX record. We don't really want this server to get out to the internet, no need. The firewall is most likely blocking it, but it shouldn't need to go through the gateway.

Internal i.p. address is 10.45.1.11, which is pingable, and i can telnet to it.

Is it just a matter of reconfiguring the settings to point to the internal i.p for the exchange server? It will never need to get out to the big bad internet.

Where are these settings? sendmail.cf doesn't seem to be the place?
 
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LEARN ABOUT REDHAT

biff

BIFF(1) 						    BSD General Commands Manual 						   BIFF(1)

NAME

     biff -- be notified if mail arrives and who it is from

SYNOPSIS

     biff [ny]

DESCRIPTION

     Biff informs the system whether you want to be notified when mail arrives during the current terminal session.

     Options supported by biff:

     n	   Disables notification.

     y	   Enables notification.

     When mail notification is enabled, the header and first few lines of the message will be printed on your screen whenever mail arrives.  A
     ``biff y'' command is often included in the file .login or .profile to be executed at each login.

     Biff operates asynchronously via the comsat(8) service. If that service is not enabled, biff will not do anything. In that case, or for syn-
     chronous notification, use the MAIL variable of sh(1) or the mail variable of csh(1).

SEE ALSO

     csh(1), mail(1), sh(1), comsat(8)

HISTORY

     The biff command appeared in 4.0BSD.

BUGS

     su(1), and biff don't seem to get on too well. This is probably due to the tty still being owned by the person using su. This can result in
     ``Permission denied'' messages when attempting to change the biff status of your session.

     Please report bugs to netbug@ftp.uk.linux.org including diffs/patches, compiler error logs or as complete a bug report as is possible.

Linux NetKit (0.17-pre-20000412)				   July 31, 1999				  Linux NetKit (0.17-pre-20000412)