HowTos/Postfix

Scalix Wiki -> How-Tos -> Postfix Integration

Replacing Sendmail with Postfix

This ist only a short discription (based on Debian), additions are highly appreciated. Follow these steps:

1. stop all sendmail services

/etc/init.d/spamass-milter stop
/etc/init.d/sendmail stop
/etc/init.d/scalix-sendmail stop

2. deinstall the packets

dpkg -P --force-depends sendmail
dpkg -P sensible-mda
dpkg -P rmail
dpkg -P sendmail-bin
dpkg -P sendmail-cf
dpkg -P sendmail-base
dpkg -P m4
dpkg -P spamass-milter

3. cleaning

3.1. remove the remaining folders:

/var/run/sendmail/stampdir
/var/run/sendmail/mta
/var/lib/sendmail
/usr/share/doc/sendmail
/etc/mail

3.2. remove remaining files:

/etc/init.d/scalix-sendmail

4. install then Postfix packets

apt-get install postfix
apt-get install postfix-tls (needed for secure relaying)
apt-get install sasl2-bin (for authentication)

5. Configure your Postfix

5.1. add this line to you master.cf:

127.0.0.1:10001 inet  n       n       n       -       -       spawn user=scalix argv=/opt/scalix/bin/unix.in

5.2. main.cf:

alias_maps =
local_recipient_maps =
mailbox_transport = smtp:[127.0.0.1]:10001
## transport_maps = hash:/etc/postfix/transport
## when you want to define additional mail-routing use transport_maps

## some rule against SPAM
smtpd_recipient_restrictions =
   reject_unauth_pipelining
   permit_mynetworks
   permit_sasl_authenticated
   reject_unauth_destination

   reject_rbl_client relays.ordb.org
   reject_rbl_client bl.spamcop.net
   reject_rbl_client dnsbl.sorbs.net
   reject_rbl_client cbl.abuseat.org
   reject_rbl_client sbl.spamhaus.org
   reject_rbl_client opm.blitzed.org
   reject_rbl_client l1.spews.dnsbl.sorbs.net

   reject_invalid_hostname
   reject_unknown_sender_domain
   reject_unknown_client
   reject_non_fqdn_sender

## use a recipent table to prevent mail-loops!
   check_recipient_access hash:/etc/postfix/recipient_access

   reject

5.3. content of an optinal transport map:

@domain.tld         smtp:[127.0.0.1]:10001

5.4. restart postfix

6. i use a script to create the recipient list

ldapsearch -h 127.0.0.1 -p 3890 -x omMailnode=Headquarters mail | grep -F mail: | cut -c 7- | awk '{print $0"\t\tOK"}' > /etc/postfix/recipients
postmap /etc/postfix/recipients

7. SMTP-Auth

7.1. create this file '/etc/postfix/sasl/smtpd.conf': pwcheck_method: saslauthd mech_list: plain, login saslauthd_path: /var/run/saslauthd/mux

7.2. modify the '/etc/default/saslauthd' (for Debian):

# This needs to be uncommented before saslauthd will be run automatically
START=yes

# You must specify the authentication mechanisms you wish to use.
# This defaults to "pam" for PAM support, but may also include
# "shadow" or "sasldb", like this:
# MECHANISMS="pam shadow"

MECHANISMS="ldap"
PARAMS="-m /var/spool/postfix/var/run/saslauthd"

7.3. create the '/etc/saslauthd.conf': (!!! UNTESTED !!!) ldap_servers: ldap://127.0.0.1:3890/ ldap_filter: UL-AUTHID=%u

7.4. restart sasl daemon

8. Testing Authentication

testsaslauthd -f /var/spool/postfix/var/run/saslauthd/mux -u user -p password

good luck!