[exim] Mail relaying

Hello Friends,
Hope you are doing fine.

We have three mail domains in our company test.com,test1.com and test2.com,
hosted on groupwise server. As spaming is a big threat that we are facing
now, we are planing to install a mail server gateway by using the well known
and powerfull EXIM. ie All the incoming mails are relaying through the exim
mail server( having public IP 217.217.217.217), then filtered using spam
assassin,acls etc and then delivered to the groupwise mail server( having
private ip 192.168.8.1) and viceversa. Let me give skelton my exim.conf so
that you will get a clear picture.

exim.conf
----------

qualify_domain = test.com

domainlist relay_domains = lsearch;/etc/virtual/relay_domains:localhost    
//where the file relay_domains contain 
test.com,test1.com,test2.com

domainlist relay_to_domains =


# These options specify the Access Control Lists (ACLs) that
# are used for incoming SMTP messages - after the RCPT and DATA
# commands, respectively.


acl_smtp_rcpt = check_recipient
acl_smtp_mime = check_mime
acl_smtp_data = check_message

#############ACL################

begin acl
check_recipient:

accept hosts = :
deny local_parts = ^.*[@%!/|] : ^\\.

  accept local_parts = postmaster
         domains = +local_domains

  accept domains = remote_domains +relay_to_domains
         endpass
         message = relay not permitted at this server
         verify = recipient
  accept hosts = +relay_from_hosts

accept

check_mime:
-------
--------
check_message:
----
-----
deny message = This message was classified as SPAM
     condition = ${if < {$message_size}{500K}}
     spam = nobody

# put headers in all messages (no matter if spam or not)
warn  spam = nobody:true
      add_header = X-Spam-Score: $spam_score ($spam_bar)
      add_header = X-Spam-Report: $spam_report

# add second subject line with *SPAM* marker when message
# is over threshold
#warn  spam = nobody
      add_header = Subject: *SPAM* $h_Subject:

# reject spam at high scores (> 12)
deny  message = This message scored $spam_score spam points.
     spam = nobody:true
      condition = ${if >{$spam_score_int}{120}{1}{0}}

############# ROUTER SETTINGS#######################
# set rules for selecting a transport#
begin routers
redirect:
driver = redirect
data = ${lookup{$local_part@$domain}lsearch{/usr/local/exim/user_alias}}

internal:                                #  To relay the mails  to our
domains
  driver = manualroute
  domains =+relay_domains
  transport = spamcheck
route_data= 192.168.8.1          # IP address of groupwise server

external:                  #To relay the mails to other domains
  driver = dnslookup
   domains = ! +local_domains
  transport   = remote_smtp
  ignore_target_hosts   =  0.0.0.0  :  127.0.0.0/8
  no_more

############# TRANSPORT SETTINGS####################
# set rules for delivery transports#
begin transports

remote_smtp:
driver = smtp

spamcheck:
driver=smtp




##########################################



Let me come to the doubts .

Please give your suggetons on this architecture?
Is this mail relaying is harmful?
If it is good how can i store the rejected mails after filtering in the
relay server especially mails filtered by spam assassin?

Any help would be great appreciable :)


Thanks,
Sal

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