OK, I've got a working solution and best of all, no recompiling
necessary! I discovered that using the aliasdir feature along with
localfilter would allow me to customize the "last ditch effort" error
message for unknown local users. What I did:
#Set maildrop to run as the localfilter:
echo "/usr/lib/courier/bin/maildrop" > /etc/courier/maildropfilter
#Setup .courier files and .mailfilters/ files for "last ditch" aliasdir
account
touch /etc/courier/aliasdir/.courier
touch /etc/courier/aliasdir/.courier-default
mkdir /etc/courier/aliasdir/.mailfilters/
touch /etc/courier/aliasdir/.mailfilters/rcptfilter
ln -s /etc/courier/aliasdir/.mailfilters/rcptfilter-default
chown -R daemon.daemon /etc/courier/aliasdir/.mailfilters/
chmod -R 0700 /etc/courier/aliasdir/.mailfilters/
#/etc/courier/aliasdir/.mailfilters/rcptfilter should be edited to contain:
include "/etc/courier/maildroprcs/baduser.md"
echo "User $BADUSER unknown"
EXITCODE=1
exit
#/etc/courier/aliasdir/maildroprcs/baduser.md should contain: (might
need to make maildroprcs folder)
BADUSER=substr($MAILFILTER,11)
BADUSER=escape($BADUSER)
BADUSER=`echo "$BADUSER" | sed 's/:/./g'`
What all this does:
Courier will try using /etc/courier/aliasdir as a last ditch effort to
find delivery instructions (see
http://www.courier-mta.org/dot-courier.html for details on this). What
we're doing is actually setting up some delivery instructions. But
we're using a rcptfilter to reject all messages with a custom error
(User <xxx> unknown). The $MAILFILTER variable is the only environment
variable we seem to have that contains the bad address in it, we need to
clean it up by removing "rcptfilter-". Also, for some reason, it
replaces all periods in the address with colons so we have to run
through sed to fix that, which means we need to include a file from the
special maildroprcs folder so that we have the ability to execute shell
commands.
Possible issues:
Courier used to return: "550 User unknown" it now returns "511 User
baduser unknown", I'm not sure if 511 will cause different behavior from
the client, of course it's still a fatal error so I don't think it matters.
Ugly I know, but works for me :-)
Jay
Jay Lee
Network/Systems Administrator
Information Technology Department
Philadelphia Biblical University
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org:Philadelphia Biblical University;Information Technology Department
adr;dom:;;;Langhorne, PA
email;internet:[EMAIL PROTECTED]
title:Network/Systems Administrator
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url:http://www.pbu.edu
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