sendmail: Domain must resolve

[Krzys Majewski <majewski@cs.ubc.ca>]

I changed my  hostname, after consulting this List, from the ugly one
given by my cable  provider to one that I like. There  is no DNS entry
anywhere for  this new hostname. Now,  I run sendmail not  as a daemon
but as  an mda or  mta or  whatever: to send  cron errors to  my usual
e-mail account. After changing  the hostname, I'm getting "Domain must
resolve" errors from sendmail (formatted strangely here to fit 70 cols):

Sep 11 07:56:12  mi sendmail[1024]: e8BEuBj01024: from=root, size=351,
class=0, nrcpts=1,
msgid=<200009111456.e8BEuBj01024@mi.crdva1.bc.wave.home.com>,
relay=root@localhost 

Sep 11 07:57:58     mi      sendmail[1024]:     e8BEuBj01024:
to=majewski@cs.ubc.ca,     ctladdr=root     (0/0),     delay=00:01:46,
xdelay=00:01:46,                mailer=relay,               pri=30351,
relay=smtp.cs.ubc.ca.  [142.103.6.52],  dsn=4.0.0, stat=Deferred:  451
<root@mi.crdva1.bc.wave.home.com>... Domain must resolve

Also, it  looks like the  mails in question  are not showing up  in my
mailbox.  So I  guess my  question is,  is there  a sendmail  flag for
stifling the DNS lookup, and what is the debian-correct way to set it?

-chris