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<h3><a name="SECTION001641000000000000000">
6.4.1 Information on VERP</a>
</h3>

<p>
You will note in the alias generating script for 2.1 above, there is a line
for VERP that has been commented out.  If you are interested in VERP there are
two options.  The first option is to allow Mailman to do the VERP formatting.
To activate this, uncomment that line and add the following lines to your
<span class="file">mm_cfg.py</span> file:

<p>
<div class="verbatim"><pre>
    VERP_FORMAT = '%(bounces)s-+%(mailbox)s=%(host)s'
    VERP_REGEXP = r'^(?P&lt;bounces&gt;.*?)-\+(?P&lt;mailbox&gt;[^=]+)=(?P&lt;host&gt;[^@]+)@.*$'
</pre></div>

<p>
The second option is a patch on SourceForge located at:

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<a class="url" href="http://sourceforge.net/tracker/?func=detail&amp;atid=300103&amp;aid=645513&amp;group_id=103">http://sourceforge.net/tracker/?func=detail&amp;atid=300103&amp;aid=645513&amp;group_id=103</a>
<p>
This patch currently needs more testing and might best be suitable for
developers or people well familiar with qmail.  Having said that, this patch
is the more qmail-friendly approach resulting in large performance gains.

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<span class="release-info">Release 2.1, documentation updated on June 29, 2008.</span>
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