I have set up a mail gateway using Ubuntu 8.04/postfix/clamav/
spamassassin/mailscanner. It stands in front of a single MS Exchange
2003 R2 server serving four mail domains. Mail to username@whichever-
domain.com is delivered to the Exchange inbox for username, which is
what we want. However, we need to flag mail addressed to one domain in
particular for special handling (say special.com).

Surprisingly, neither Exchange nor Outlook can reliably identify the
recipient domain as a rule condition. (They can check for text in
headers, though.) Exchange does have the hooks for coding this, but
writing, testing and maintaining an SMTP sink would be a major
undertaking for such a seemingly minor result.

I feel sure that postfix or mailscanner could handle this easily,
i.e. if the recipient domain is special.com, add a header "X-
Special:true". Am I right, and if so, can anyone point me to the right
place to configure it?

TIA

Hello, I am currtenly looking at to programs dnrd and rbldnsd. I get
results from both programs using dig but i am unable to get the
correct reply using rblcheck. I started the server using

RBLDNSD="dsbl -r/var/lib/rbldns -b myiphere/53 \
myservername.mydomain.org:ip4set:clients"

and I can retrieve results using sothing like

dig 223.61.83.162.myservename.myserverdomain.org -t txt @myserverip

where 223.61.83.162 is the ip of the host being blocked but reversed
found in the file clients

The problem i am having is that if i use any rbl client like rblcheck
i dont get any results

if i do

rblcheck -s myservername.myserverip.org 162.83.61.223

the rblcheck program can find the ip 162.83.61.223

does anyone know if rblcheck queries upd port 53 in the same way that
dig does? any suggestions?

thanks.

I use postfix as for local delivery as for relay to an mx exchange. I
want to use greylisting and DNSBL. This ar my restrictions:

smtpd_data_restrictions =
reject_multi_bounce

smtpd_sender_restrictions =
reject_non_fqdn_sender
reject_unknown_sender_domain

I've configured a postfixmailserver as an frontend of ms exchange so
postfix has got an transport "domain.tld smtp:[ip_of_msex]. Now I got
the request dor transport one special address to another host
"user@domain.tld smtp:[ip_of_special_host] - thats not the problem I
think. But: this special host is seldom online so I have to to
increase the queuel lifetime (or whatever - I dont know the right word
for) to one e.g. month. How to do that, please help.

regards

Ronny Seffner