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t d t d f g S( NR t Discardt Rejects Forward to List Ownert Preserves> Policies concerning the content of list traffic.
<p>Content filtering works like this: when a message is
received by the list and you have enabled content filtering, the
individual attachments are first compared to the
<a href="?VARHELP=contentfilter/filter_mime_types">filter
types</a>. If the attachment type matches an entry in the filter
types, it is discarded.
<p>Then, if there are <a
href="?VARHELP=contentfilter/pass_mime_types">pass types</a>
defined, any attachment type that does <em>not</em> match a
pass type is also discarded. If there are no pass types defined,
this check is skipped.
<p>After this initial filtering, any <tt>multipart</tt>
attachments that are empty are removed. If the outer message is
left empty after this filtering, then the whole message is
discarded.
<p> Then, each <tt>multipart/alternative</tt> section will
be replaced by just the first alternative that is non-empty after
filtering if
<a href="?VARHELP=contentfilter/collapse_alternatives"
>collapse_alternatives</a> is enabled.
<p>Finally, any <tt>text/html</tt> parts that are left in the
message may be converted to <tt>text/plain</tt> if
<a href="?VARHELP=contentfilter/convert_html_to_plaintext"
>convert_html_to_plaintext</a> is enabled and the site is
configured to allow these conversions.t filter_contentt Not Yesi s_ Should Mailman filter the content of list traffic according
to the settings below?t filter_mime_typesi
sJ Remove message attachments that have a matching content
type.s Use this option to remove each message attachment that
matches one of these content types. Each line should contain a
string naming a MIME <tt>type/subtype</tt>,
e.g. <tt>image/gif</tt>. Leave off the subtype to remove all
parts with a matching major content type, e.g. <tt>image</tt>.
<p>Blank lines are ignored.
<p>See also <a href="?VARHELP=contentfilter/pass_mime_types"
>pass_mime_types</a> for a content type whitelist.t pass_mime_typess Remove message attachments that don't have a matching
content type. Leave this field blank to skip this filter
test.s Use this option to remove each message attachment that does
not have a matching content type. Requirements and formats are
exactly like <a href="?VARHELP=contentfilter/filter_mime_types"
>filter_mime_types</a>.
<p><b>Note:</b> if you add entries to this list but don't add
<tt>multipart</tt> to this list, any messages with attachments
will be rejected by the pass filter.t filter_filename_extensionssP Remove message attachments that have a matching filename
extension.t pass_filename_extensionss Remove message attachments that don't have a matching
filename extension. Leave this field blank to skip this filter
test.t collapse_alternativessU Should Mailman collapse multipart/alternative to its
first part content?t convert_html_to_plaintexts Should Mailman convert <tt>text/html</tt> parts to plain
text? This conversion happens after MIME attachments have been
stripped.t
filter_actionsO Action to take when a message matches the content filtering
rules.sK One of these actions is taken when the message matches one of
the content filtering rules, meaning, the top-level
content type matches one of the <a
href="?VARHELP=contentfilter/filter_mime_types"
>filter_mime_types</a>, or the top-level content type does
<strong>not</strong> match one of the
<a href="?VARHELP=contentfilter/pass_mime_types"
>pass_mime_types</a>, or if after filtering the subparts of the
message, the message ends up empty.
<p>Note this action is not taken if after filtering the message
still contains content. In that case the message is always
forwarded on to the list membership.
<p>When messages are discarded, a log entry is written
containing the Message-ID of the discarded message. When
messages are rejected or forwarded to the list owner, a reason
for the rejection is included in the bounce message to the
original author. When messages are preserved, they are saved in
a special queue directory on disk for the site administrator to
view (and possibly rescue) but otherwise discarded. This last
option is only available if enabled by the site
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