I've just recently had the same problem (sendmail 8.13.8-3 / Debian Etch) The problem first occurred when I booted the box without the network cable plugged in. The network interface got configured with a remembered ip adress, but obviously, DNS is not available. Hence, the /etc/network/if-up.d/sendmail script failed (?) to determine my hostname, and messed up dialup.m4 by inserting a dns-error message
I expected the box to recover when rebooting with the network connected, but it didn't. Manually calling /etc/network/if-up.d/sendmail as /etc/network/if-up.d/sendmail 192.168.11.2 '' eth0 seems to solve the issue for me (dialup.m4 gets rewritten correctly, and isn't messed up again by subsequent ifup/ifdowns I did not yet investigate why /etc/network/if-up.d/sendmail feels the need to update my hostname only when dns is absent, but not when it is present. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

