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Hello,

   In my university we earlier had NAT:ed addresses (10.10.x.y).
Recently, they went over to assigning us public IP addresses.

   I assumed that this wouldn't mean anything other than that I would
get a new IP, but I was (unpleasanly) surprised to notice that sendmail
said something along the line of "unable to qualify my own domain name"
when I restarted the system. Same messages poped up on the first console
when my daily cron jobs started. After searching the net for suggestions
I tried changing a line in /etc/hosts from:

   a.b.c.d            myhost

to

   a.b.c.d            myhost myhost.

   This change helped.. Somewhat. The error is gone, but when I try
sending a message:

# sendmail -t
To: root
Subject: test

Test!
^D
#

   I do get a message, but it only contains information about how the
message couldn't be delivered to "root". Same thing happens when the
cron jobs run. I also tried:

# mail root
...

But I still only get the error message.

   Please let me know what could be wrong.. I use the mail system to
keep track of what is going on in my system.

Thankful for any hints or tips.

-- 
Kind Regards,
Jan Danielsson
Te audire non possum. Musa sapientum fixa est in aure.

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