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<H1><A NAME="SECTION001800000000000000000">
17. Bounce management</A>
</H1>
<P>
<I>Sympa</I> allows bounce (non-delivery report) management. This
prevents list owners from receiving each bounce (1 per message
sent to a bouncing subscriber) in their own mailbox. Without
automatic processing of bounces, list owners either go
mad, or just delete them without further attention.
<P>
Bounces are received at mylist-owner address, which should
be sent to the <A NAME="8190"></A><TT>bouncequeue</TT> program via aliases :
<P><PRE>
\samplelist-owner: "|/home/sympa/bin/bouncequeue \samplelist"
</PRE>
<P>
<A NAME="8193"></A><TT>bouncequeue</TT> (see <A HREF="node3.html#binaries">2.2</A>, page <A HREF="node3.html#binaries"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>) stores bounces in a
<A NAME="8196"></A><TT>/home/sympa/spool/bounce/</TT> spool.
<P>
Bounces are then processed by the <A NAME="8199"></A><TT>bounced.pl</TT> daemon.
This daemon analyses bounces to find out which
e-mail addresses are concerned and what kind of error was generated.
If bouncing addresses match a subscriber's address, information
is stored in the <I>Sympa</I> database (in subscriber_table). Moreover, the most recent
bounce itself is archived in <A NAME="8203"></A><TT>bounce_path/mylist/email</TT>
(where bounce_path is defined in a <A NAME="8206"></A><TT>wwsympa.conf</TT> parameter and
email is the user e-mail address).
<P>
When reviewing a list, bouncing addresses are tagged as bouncing.
You may access further information such as dates of first and last bounces,
number of received bounces for the address, the last bounce itself.
<P>
With these informations, the automatic bounce management is possible:
<P>
<UL>
<LI>The automatic task <A NAME="8209"></A><TT>eval_bouncer</TT> gives a score foreach bouncing user.
The score, between 0 to 100, allows the classification of bouncing users in two levels.
(Level 1 or 2).
According to the level, automatic actions are executed periodicaly by <A NAME="8212"></A><TT>process_bouncers</TT>
task.
<P>
</LI>
<LI>The score evaluation main parameters are:
<P>
<A NAME="8215"></A><TT>Bounces count</TT>: The number of bouncing messages received by sympa for the user.
<P>
<A NAME="8218"></A><TT>Type rate</TT> : Bounces are classified depending on the type of errors generated on the user
side. If the error type is "mailbox is full" (ie a temporary 4.2.2 error type) the type rate will be
0.5 whereas permanent errors (5.x.x) have a type rate equal to 1.
<P>
<A NAME="8221"></A><TT>Regularity rate</TT> : This rate tells if the bounces where received regularly, compared to list
traffic. The list traffic is deduced from <A NAME="8224"></A><TT>msg_count</TT> file data.
<P><PRE>
The score formula is :
Score = bounce_count * type_rate * regularity_rate
</PRE>
<P>
To avoid making decisions (ie defining a score) without enough relevant data, the score is not
evaluated if :
<P>
<UL>
<LI>The number of the number of received bounces is lower than <A NAME="8227"></A><TT>minimum_bouncing_count</TT>
(see <A HREF="node6.html#kw-minimum-bouncing-count">5.8.9</A>, page <A HREF="node6.html#kw-minimum-bouncing-count"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)
<P>
</LI>
<LI>The bouncing period is shorter than <A NAME="8230"></A><TT>minimum_bouncing_period</TT>
(see <A HREF="node6.html#kw-minimum-bouncing-period">5.8.10</A>, page <A HREF="node6.html#kw-minimum-bouncing-period"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]" SRC="crossref.png"></A>)
<P>
</LI>
</UL>
<P>
</LI>
<LI>You can define the limit between each level via the <B>List configuration pannel</B>,
in subsection <B>Bounce settings</B>. (see <A HREF="node16.html#rate">15.5.2</A>) The principle consists in
associating a score interval with a level.
<P>
</LI>
<LI>You can also define wich action must be applied on each category of user.(see <A HREF="node16.html#action">15.5.2</A>)
Each time an action will be done, a notification email will be send to the person of your choice.
(see <A HREF="node16.html#notification">15.5.2</A>)
<P>
</LI>
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