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<h3><a name="SECTION001612000000000000000"></a><a name="postfix-virtual"></a>
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6.1.2 Virtual domains
</h3>

<p>
<div class="note"><b class="label">Note:</b>

This section describes how to integrate Mailman with Postfix for automatic
generation of Postfix virtual_alias_maps for Mailman list addresses. Mailman's
support of virtual domains is limited in that list names must be globally
unique within a single Mailman instance, i.e., two lists may not have the same
name even if they are in different domains.
</div>

<p>
Postfix 2.0 supports ``virtual alias domains'', essentially what used to be
called ``Postfix-style virtual domains'' in earlier Postfix versions.  To make
virtual alias domains work with Mailman, you need to do some setup in both
Postfix and Mailman.  Mailman will write all virtual alias mappings to a file
called, by default, <span class="file">/usr/local/mailman/data/virtual-mailman</span>.  It will
also use <b class="program">postmap</b> to create the <b class="program">virtual-mailman.db</b> file
that Postfix will actually use.

<p>
First, you need to set up the Postfix virtual alias domains as described in
the Postfix documentation (see Postfix's <code>virtual(5)</code> manpage).  Note
that it's your responsibility to include the <code>virtual-alias.domain
anything</code> line as described manpage (in recent Postfix this is not required
if the domain is included in virtual_alias_domains in main.cf); Mailman will
not include this line in <span class="file">virtual-mailman</span>.  You are highly encouraged to
make sure your virtual alias domains are working properly before integrating
with Mailman.

<p>
Next, add a path to Postfix's <var>virtual_alias_maps</var> variable, pointing to
the virtual-mailman file, e.g.:

<p>
<div class="verbatim"><pre>
    virtual_alias_maps = &lt;your normal virtual alias files&gt;,
        hash:/usr/local/mailman/data/virtual-mailman
</pre></div>

<p>
assuming you've installed Mailman in the default location.  If you're using an
older version of Postfix which doesn't have the <var>virtual_alias_maps</var>
variable, use the <var>virtual_maps</var> variable instead.

<p>
Next, in your <span class="file">mm_cfg.py</span> file, you will want to set the variable
<var>POSTFIX_STYLE_VIRTUAL_DOMAINS</var> to the list of virtual domains that Mailman
should update.  This may not be all of the virtual alias domains that your
Postfix installation supports!  The values in this list will be matched
against the <var>host_name</var> attribute of mailing lists objects, and must be an
exact match.

<p>
Here's an example.  Say that Postfix is configured to handle the virtual
domains <code>dom1.ain</code>, <code>dom2.ain</code>, and <code>dom3.ain</code>, and further
that in your <span class="file">main.cf</span> file you've got the following settings:

<p>
<div class="verbatim"><pre>
    myhostname = mail.dom1.ain
    mydomain = dom1.ain
    mydestination = $myhostname, localhost.$mydomain
    virtual_alias_maps =
        hash:/some/path/to/virtual-dom1,
        hash:/some/path/to/virtual-dom2,
        hash:/some/path/to/virtual-dom2
</pre></div>

<p>
If in your <span class="file">virtual-dom1</span> file, you've got the following lines:

<p>
<div class="verbatim"><pre>
    dom1.ain  IGNORE
    @dom1.ain @mail.dom1.ain
</pre></div>

<p>
this tells Postfix to deliver anything addressed to <code>dom1.ain</code> to the
same mailbox at <code>mail.dom1.com</code>, its default destination.

<p>
In this case you would not include <code>dom1.ain</code> in
<var>POSTFIX_STYLE_VIRTUAL_DOMAINS</var> because otherwise Mailman will write
entries for mailing lists in the dom1.ain domain as

<p>
<div class="verbatim"><pre>
    mylist@dom1.ain         mylist
    mylist-request@dom1.ain mylist-request
    # and so on...
</pre></div>

<p>
The more specific entries trump your more general entries, thus breaking the
delivery of any <code>dom1.ain</code> mailing list.

<p>
However, you would include <code>dom2.ain</code> and <code>dom3.ain</code> in
<span class="file">mm_cfg.py</span>:

<p>
<div class="verbatim"><pre>
    POSTFIX_STYLE_VIRTUAL_DOMAINS = ['dom2.ain', 'dom3.ain']
</pre></div>

<p>
Now, any list that Mailman creates in either of those two domains, will have
the correct entries written to <span class="file">/usr/local/mailman/data/virtual-mailman</span>.

<p>
As above with the <span class="file">data/aliases*</span> files, you want to make sure that both
<span class="file">data/virtual-mailman</span> and <span class="file">data/virtual-mailman.db</span> are user and
group owned by <code>mailman</code>.

<p>

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