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From: rickert@mp.cs.niu.edu (Neil Rickert)
Newsgroups: comp.mail.sendmail
Subject: Re: Help with sendmail error: cannot prescan canonical hostname
Message-ID: <1991Apr23.233028.29806@mp.cs.niu.edu>
Date: 23 Apr 91 23:30:28 GMT
References: <1991Apr23.222025.12890@zaphod.mps.ohio-state.edu>
Organization: Northern Illinois University
Lines: 33

In article <1991Apr23.222025.12890@zaphod.mps.ohio-state.edu> alden@shape.mps.ohio-state.edu (Dave Alden) writes:
>
>Hello,
>  I used to occasionally get the following error:
>
>Apr 23 17:13:14 triangle.mps.ohio-state.edu sendmail[5622]: AA05622: SYSERR:
>rewrite: cannot prescan canonical hostname:
>
>But over the last couple of weeks I've been getting it almost once/day.  It
>only seems to happen when receiving mail from sites which have send out mail
>using a name which is actually a nickname (ie: math.harvard.edu).  Is there
>some way to fix this?

  Most likely there is a bug somewhere in 'sendmail.cf'.  Try testing some
of these hostnames by hand using 'sendmail -bt'.  You will have to look
through 'sendmail.cf' to find which ruleset might be involved, and
then specifically test the address for that ruleset.

  Look for rules with the $[ ... $] operation in them.  For example
you might see something like:

R$*<@$+>$*	$:$1<@$[$2$]>$3

 The most likely cause is that you are off by one in your count of the $n
variables on the right, or have something else slightly out of order.
If, for example, in the above, the $2 (or what ever was between $[ and $] )
had an unbalanced set of '<' and '>' you would get that error.

-- 
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  Neil W. Rickert, Computer Science               <rickert@cs.niu.edu>
  Northern Illinois Univ.
  DeKalb, IL 60115                                   +1-815-753-6940