Yes I could have done that, but just because my user has a
email on the exchange server does not mean I want them to
get any email from the outside world 
-----Original Message-----
From: David Sims [mailto:dpsims dpsims.com]
Sent: Monday, August 21, 2006 5:33 PM
To: Dan OConnor
Cc: maia-usersrenaissoft.com
Subject: Re: [Maia-users] relay_recipient_maps for postfix
Hi,
I think you want to use the postfix
reject_unverified_recipient command.
See http://www.postfix.org/ADDRESS_VERIFICATION_README.ht
ml.... The
reject_unverified_recipient will probe the downstream
postoffice to see if
the recipient is a valid one... and if not then reject the
message with a
450 (or 550 if you also use unverified_recipient_reject_code
= 550)...
Dave
************************************************************
***************
On Mon, 21 Aug 2006, Dan OConnor wrote:
> Hi All,
>
> I setup a script to pull a list of users from the Maia
db and use it for
> postfix for the relay_recipient_maps so it will reject
mail coming into
> the system that is not going to a valid mailbox. I have
spent the last
> couple weeks looking for something to do it, but either
I am oblivious
> to the utterly obvious and did not see it listed
anywhere or I just was
> not asking Google the right questions. I am hardly an
expert so if you
> see anything missing or have idea give me a shout.
>
>
>
> =====================================================
>
>
>
> First in your main.cf file add this to the bottom.
>
> relay_recipient_maps =
hash:/etc/postfix/relay_recipients
>
>
>
> Also add this line, it can help to stop DOS attacks,
got it from the
> list, I can't remember who though, but thanks!
>
> unverified_recipient_reject_code = 550
>
>
>
> Do not restart postfix just yet
>
> Go to your scripts dir in Maia and create a new file
called 'list' and
> add this to it.
>
>
>
> email
>
> yourdomain.com
>
> .
>
>
>
> You can also add any other domains you have in maia
here.
>
> Next make a new file called 'exportemail'
>
>
>
> #! /bin/bash
>
>
#########################################################
>
> # ExportEmail
>
> # -- Created By Dan O, Aug 21st 2006 --
>
> # Legacyboy at gmail dot com
>
> # This will export a list of users from the Maia
>
> # MySQL DB and creat the relay_recipients file
>
> # for Postfix.
>
>
########################################################
>
>
>
>
>
> ##Get the list of users from MySQL
>
>
>
> echo "select email from users;" | mysql -u
user -ppassword -D maia >
> dump
>
>
>
> ##Now remove the lines of Junk at the top
>
>
>
> IFS=$'\n'
>
> for NAME in $(cat list)
>
> do
>
> sed -i "\|^$NAME\$|d" dump
>
> done
>
>
>
> ##Add a OK to the end of each address
>
>
>
> sed 's/$/ OK/g' dump > relay_recipients
>
>
>
> ## Remove the dump file
>
> rm dump
>
>
>
> #Move the file to the /etc/postfix dir
>
> cp relay_recipients /etc/postfix/relay_recipients
>
> rm relay_recipients
>
> #Now we need to postmap the file so postfix can read
it.
>
> postmap /etc/postfix/relay_recipients
>
>
>
> ##-Fin-##
>
>
>
>
>
> Don't forget to chmod a+x the file.
>
> Then you can give it a run, check the final file in
/etc/postfix/ it
> should look like this
>
> emaildomain.com OK
>
> email2domain.com OK
>
> email3domain.com OK
>
> etc...
>
>
>
> If it looks good, give postfix a kick, if it breaks
just rem out those
> two lines we added.
>
>
>
> I have set mine up to run as a cron job every hour to
make sure the file
> is always up to date,
>
> Also at this point it will only run as root. (I know, I
know, I will fix
> it soon).
>
>
>
> Dan O'Connor CNA
>
> Network Support Technician
>
> St. Amant
>
> Ph: (204) 256-4301 ext. 2321
>
> Fax: (204) 254-3768
>
> Email: doconnorstamant.mb.ca
>
>
>
>
>
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