How mailscanner works with Postfix
Postfix can be handled slightly differently from the other supported
mail systems, as one copy of Postfix can handle both the incoming mail
via SMTP, and the outgoing mail by doing all the delivery.
How to Set Up Postfix for MailScanner Use
- Install Postfix version 2 and get it all working.
- Stop Postfix using a command
postfix stop
- Make sure you have the chroot jail set up in /var/spool/postfix.
You should be able to see "etc", "usr" and "lib" directories inside
/var/spool/postfix). If
you haven't got the chroot jail setup already, then look in the "examples"
directory of the Postfix documentation and you will find a script in there
to set up it up for your operating system. If you can't find that, then see
the "Problems or Errors" section further down this page.
- At this point, things change from the setup for other MTAs as we can make
it run with just one copy of Postfix, and let Postfix do the "split MTA" setup
for us.
- In the Postfix configuration file /etc/postfix/main.cf add this line:
header_checks = regexp:/etc/postfix/header_checks
- In the file /etc/postfix/header_checks add this line:
/^Received:/ HOLD
The effect of this is to tell Postfix to move all messages to the HOLD
queue.
How to Set up MailScanner for Use with Postfix
In your MailScanner.conf file (probably in /etc/MailScanner or
/opt/MailScanner/etc), there are 5 settings you need to change. They
are all really near the top of the file. The settings are
Run As User = postfix
Run As Group = postfix
Incoming Queue Dir = /var/spool/postfix/hold
Outgoing Queue Dir = /var/spool/postfix/incoming
MTA = postfix
You will need to ensure that the user "postfix" can write to
/var/spool/MailScanner/incoming and /var/spool/MailScanner/quarantine:
chown postfix.postfix /var/spool/MailScanner/incoming
chown postfix.postfix /var/spool/MailScanner/quarantine
If you upgrade your copy of MailScanner, unfortunately these
directories will be changed back to being owned by root, so you will
have to do those 2 commands again.
Starting It All Running
If on a system installed using the RedHat RPM distribution,
just use the init.d script to do it all for you:
/etc/rc.d/init.d/MailScanner start
(or on RedHat systems just
service MailScanner start)
If not using the RedHat RPM distribution, then
- Start Postfix
postfix start
- Start MailScanner
check_MailScanner
Problems or Errors
If you are using RedHat Linux and Postfix or sendmail, please make sure that
your system is switched to the correct mail system.
You can set this by running the command
redhat-switchmail-nox
and then pick the mail system you want to use.
If you are using SuSE Linux, you will need to check you only have
one of sendmail, Postfix or exim installed. The yast2 installation
program can be used to do this.
- sendmail: invalid option -- O
- See the paragraph above. You have your RedHat system set to use Postfix
while you are telling MailScanner to use sendmail. Both settings must be
the same.
- Unknown service
- If you get lots of "smtp/tcp" "unknown service" errors in your maillog
when you send a test message through it, then either your chroot jail is
set up wrong or you haven't got one at all. Take a look in
/etc/postfix/master.cf and find the "chroot" column in the table of
settings. Set all "y" to "n" in this column so that it doesn't try
to chroot.
- If you want to use chroot but can't get it
right, then download a copy of Postfix version 2 from . In the distribution
documentation directories, you will find a script that will set up the
chroot jail for your operating system. Run that script and then try
using the chroot jail again.
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