howdy-
i have written a few patches for qmail, one of which implements a
RCPT TO check to verify whether or not the recipient address exists
or not (like the chkuser patch, but which reads a cdb file and can
therefore run on a machine which is not the same machine where
vpopmail is running... and which doesn't require vpopmail in order to
compile qmail.) this web page describes the patch:
http://qmail.jms1.net/patches/validrcptto.cdb.shtml
the biggest issue with implementing this functionality is determining
when to rebuild the cdb file. the best thing i've been able to come
up with so far is a cron job which builds a new list, and then if the
list has changed since the last time the cron job was run, turns that
list into the cdb file. this approach has two problems- (1) it's a
lot more CPU-intensive than it needs to be, and (2) it introduces an
artificial delay between the time a mailbox is created and the time
it shows up in the validrcptto.cdb file.
the solution to this would be to have vpopmail trigger the updating
of the cdb file whenever certain events happen- a domain, mailbox, or
alias is added or deleted, for example.
since different people may want to do different things with this
trigger functionality, i figured the best way to implement it would
be to have vpopmail call a specific executable, which the
administrator could set up as a shell script to do whatever they need
done- rebuild a cdb file, replicate new data to external servers,
whatever.
i have written a patch against vpopmail-5.4.15 which causes any
changes to trigger ~vpopmail/etc/onchange, if it exists and if it
is executable to the userid which is running the vpopmail program.
the patch can be downloaded, and simple directions found, at the
bottom of this page:
http://qmail.jms1.net/patches/
i am running this on my own server as we speak- it seems to work well
so far, and i will be writing the scripting to have it build a new
validrcptto.cdb over the next day or two.
my hope is that there is enough interest in this functionality that
it can be integrated into a future verison of vpopmail.
--
| John M. Simpson - KG4ZOW - Programmer At Large |
| http://www.jms1.net/ [EMAIL PROTECTED] |
--
| Mac OS X proves that it's easier to make UNIX |
| pretty than it is to make Windows secure. |
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