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<title>The Exim FAQ Section 27</title>
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<h1>The Exim FAQ</h1>
<a href="FAQ.html#TOC">Contents</a>
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<h2><a href="FAQ.html#TOC403">98. CONFIGURATION COOKBOOK</a></h2>
<p>
<a name="TOC404" href="FAQ.html#TOC404">Q9801:</a> How do I configure Exim as part of TPC (<a href="http://www.tpc.int">http://www.tpc.int</a>)?
</p>
<p>
<font color="#00BB00">A9801:</font> Suppose you want to accept faxes destined for 1(801)539-*. These are
addressed to the domain <i>9.3.5.1.0.8.1.tpc.int</i>. Set up a transport to
handle the delivery:
</p>
<pre>
tpc:
driver = pipe
command = /usr/local/tpc/tpcmailer.pl $local_part@$domain \
$sender_address
pipe_as_creator</pre>
<p>
<i>/usr/local/tpc/tpcmailer.pl</i> is the mail processing script that can
be obtained from the TPC distribution. Create a router to route mail
for the TPC domain to that transport. This must be placed before your
other routers:
</p>
<pre>
tpc_router:
driver = accept
transport = tpc
domains = *.9.3.5.1.0.8.1.tpc.int</pre>
<p>
Of course, there are other things to do as well before your system is
a functioning TPC server.
</p>
<p>
<a name="TOC405" href="FAQ.html#TOC405">Q9802:</a> How do I configure Exim so that it sends mail to the outside world only
from a restricted list of our local users?
</p>
<p>
<font color="#00BB00">A9802:</font> You will need to have a convenient way of checking the list. If it is
only a handful of users, you could just list them inline. Otherwise, you
need to put them in a file or database. Let's suppose you've just got a
list in a file. Put this as your first router:
</p>
<pre>
check_outgoing:
driver = redirect
domains = ! +local_domains
senders = ! : ! lsearch;/etc/permitted/senders
allow_fail
data = :fail: you are not allowed to send outside</pre>
<p>
The senders should be listed as complete addresses, with both a local
part and a domain. For a large list, use a DBM or cdb file instead, or
a database. The first item in the <tt>senders</tt> list is empty, to match the
empty sender. This is necessary because bounce messages have null
senders.
</p>
<p>
<a name="TOC406" href="FAQ.html#TOC406">Q9803:</a> A site for which I provide secondary MX is down for some time. Is there
a way to run the queue for that destination separately from the main
queue?
</p>
<p>
<font color="#00BB00">A9803:</font> No, because Exim does not have the concept of ``the queue for that
destination''. It simply has a single pool of messages awaiting delivery
(and some of them may have several destinations). The best approach to
this is to arrange for all messages for the site to be saved somewhere
other than the main spool, either on a separate dedicated MTA, or in
BSMTP files.
</p>
<p>
<a name="TOC407" href="FAQ.html#TOC407">Q9804:</a> We want to be able to temporarily lock out a user by disabling the
password and moving the home directory to another place. How can we
arrange to reject mail for users in this state?
</p>
<p>
<font color="#00BB00">A9804:</font> Change the home directory pointer in the passwd file to something
distinctive. For example, we use <i>/home/CANCELLED</i> for cancelled users.
Then you can pick up such users with this router, which is placed
immediately after <b>system_aliases</b>:
</p>
<pre>
cancelled_users:
driver = redirect
check_local_user
condition = ${if eq {$home}{/home/CANCELLED}{yes}{no}}
allow_fail
data = :fail: this account is cancelled</pre>
<p>
<a name="TOC408" href="FAQ.html#TOC408">Q9805:</a> How can I configure Exim so that all mails addressed to
<i>something@username.domain.net</i> get delivered to
<i>/var/spool/mail/username</i>?
</p>
<p>
<font color="#00BB00">A9805:</font> Assuming that you have set up <i>username</i> as a normal user, with
conventional routing for <i>username@domain.net</i> to that mailbox, all
you need to do is set up a redirection, using a router like this:
</p>
<pre>
user_in_domain:
driver = redirect
data = ${if match{$domain}{\N^(.*)\.domain\.net$\N}\
{$1}fail}@domain.net</pre>
<p>
If you set <tt>envelope_to</tt> in the <b>appendfile</b> transport, the original
envelope address is preserved in the message in an <i>Envelope-to:</i>
header line.
</p>
<p>
<a name="TOC409" href="FAQ.html#TOC409">Q9806:</a> How do I get exim not to add a <i>Sender:</i> header to locally originated
mail?
</p>
<p>
<font color="#00BB00">A9806:</font> It adds it only if the <i>From:</i> header doesn't correspond to the user
sending the message. You can suppress this by setting
<tt>no_local_from_check</tt>. If your real question is <i>How do I submit mail
from UUCP without it adding <i>Sender:</i>?</i>, see <a href="FAQ_15.html#TOC320">Q1503</a>.
</p>
<p>
<a name="TOC410" href="FAQ.html#TOC410">Q9807:</a> Is there any way to have messages sent to a specific local address
delayed by - say - 24 hours?
</p>
<p>
<font color="#00BB00">A9807:</font> Set up a router like this:
</p>
<pre>
delay:
driver = redirect
domains = the.domain
local_parts = thelocalpart
condition = ${if < {$message_age}{86400}{yes}{no}}
allow_defer
data = :defer: message not old enough
no_verify</pre>
<p>
Of course, this will also have the effect of setting a retry time for
the address. You may want to set a special retry rule for it. Note the
use of <tt>no_verify</tt> to ensure that this router is not used when Exim is
verifying addresses.
</p>
<p>
<a name="TOC411" href="FAQ.html#TOC411">Q9808:</a> I have a mailing list exploder on one host, and three other hosts where
I want to do the actual deliveries from. How can I get Exim to split
a message into groups of recipients between the three hosts?
</p>
<p>
<font color="#00BB00">A9808:</font> Set up a router that routes all remote addresses to a specific
transport, with a list of your three hosts. For example:
</p>
<pre>
send_to_three:
driver = manualroute
transport = to_three_smtp
route_list = !+local_domains hostA:hostB:hostC</pre>
<p>
The transport looks like this:
</p>
<pre>
to_three_smtp:
driver = smtp
hosts_randomize</pre>
<p>
By setting <tt>hosts_randomize</tt>, you request that the host list be sorted
randomly each time the transport is called, in order to spread the load.
The number of times the transport is called for each message depends on
the setting of the global option <tt>remote_max_parallel</tt>. If it is set to
1, the transport is called only once for each message, so only one host
is used, but different messages use different hosts because of the
randomizing.
</p>
<p>
The <tt>max_rcpt</tt> option (default 100) controls the number of addresses
sent in each copy of the message - several copies are sent over the
same connection if necessary.
</p>
<p>
If you want individual messages to be split between the three hosts, you
must set the global option <tt>remote_max_parallel</tt> to 3. This allows Exim
to run 3 separate instances of the transport at once. It will pass
one-third of all the addresses to each instance. Because the host list
is randomized, not round-robinned, there is no guarantee that a single
message will use all three hosts, but on average it should.
</p>
<p>
<a name="TOC412" href="FAQ.html#TOC412">Q9809:</a> Can I configure Exim so that my gateway host sends a copy of each
incoming message to each of two internal hosts?
</p>
<p>
<font color="#00BB00">A9809:</font> The easiest way to do this is to make use of the <tt>unseen</tt> router option,
and set up two separate routers. You need to be able to identify
incoming messages somehow. Typically this can be done by testing the
domain of the recipient address, in which case the configuration should
contain something like this:
</p>
<pre>
r1:
driver = manualroute
domains = ! *.your.domain.example
route_data = * host1.your.domain.example
transport = remote_smtp
unseen</pre>
<pre>
r2:
driver = manualroute
domains = ! *.your.domain.example
route_data = * host2.your.domain.example
transport = remote_smtp</pre>
<p>
The <tt>unseen</tt> setting on <b>r1</b> means that after it has accepted an
address, the address is also passed on to <b>r2</b>, and so two deliveries
occur.
</p>
<p>
<a name="TOC413" href="FAQ.html#TOC413">Q9810:</a> How can I implement “SMTP-after-POP” with Exim?
</p>
<p>
<font color="#00BB00">A9810:</font> See <a href="FAQ_7.html#TOC239">Q0706</a>.
</p>
<p>
<a name="TOC414" href="FAQ.html#TOC414">Q9811:</a> I would like to “tap off” a proportion of real mail traffic from my
live mail server to use in tests of a new server. I want to preserve the
envelope contents, but to suppress any error notifications to the
original sender.
</p>
<p>
<font color="#00BB00">A9811:</font> See <a href="C046.txt">C046</a>.
</p>
<p>
<a name="TOC415" href="FAQ.html#TOC415">Q9812:</a> How can I lookup data from a single file using both single IP addresses
and IP address blocks as keys? I want to set <tt>smtp_accept_max_per_host</tt>
by this means, and also include a default.
</p>
<p>
<font color="#00BB00">A9812:</font> You cannot do this in a single lookup, because you need separate lookups
for individual addresses and address blocks. However, these lookups can
be nested in a single expansion string. For example, suppose you are
using an lsearch file with entries like this:
</p>
<pre>
192.168.34.35: 4
192.168.34.0/24: 2
*: 1</pre>
<p>
You can use this setting:
</p>
<pre>
smtp_accept_max_per_host = \
${lookup{$sender_host_address}lsearch{/path/to/file}\
{$value}\
{\
${lookup{${mask:$sender_host_address/24}}lsearch*{/path/to/file}}\
}}</pre>
<p>
Note that the first lookup does not have an asterisk on the search
type. If you have blocks of different sizes (/24, /26, etc) you have to
configure it to do a separate lookup for each size, with just the final
one using a default.
</p>
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