<sect2 id="eresources-mailfiltering">

      <title>Filtering on the mailing lists</title>

      <para>The &os; mailing lists are filtered in multiple ways to

        avoid spam, viruses, and other unwanted emails to be

        distributed on the mailing lists.  The filtering actions

        described in this section does not cover all the filtering

        mechanisms used to protect the mailing lists.</para>

      <para>Only certain types of attachments are allowed on the

	mailing lists.  All attachments with a MIME content type not

	found in the list below, will be stripped before an email is

	distributed on the mailing lists.</para>

      <itemizedlist>

	<listitem>

	  <para>application/octet-stream</para>

	</listitem>

	<listitem>

	  <para>application/pdf</para>

	</listitem>

	<listitem>

	  <para>application/pgp-signature</para>

	</listitem>

	<listitem>

	  <para>application/x-pkcs7-signature</para>

	</listitem>

	<listitem>

	  <para>message/rfc822</para>

	</listitem>

	<listitem>

	  <para>multipart/alternative</para>

	</listitem>

	<listitem>

	  <para>multipart/related</para>

	</listitem>

	<listitem>

	  <para>multipart/signed</para>

	</listitem>

	<listitem>

	  <para>text/html</para>

	</listitem>

	<listitem>

	  <para>text/plain</para>

	</listitem>

	<listitem>

	  <para>text/x-patch</para>

	</listitem>

      </itemizedlist>

      <note>

	<para>Some of the mailing lists might allow attachments of

	  other MIME content types, but the above list should be

	  applicable for most for the mailing lists.</para>

      </note>

      <para>If an email contain both a HTML and a plain text version,

	the HTML part will be removed.  If an email contain only a

	HTML version, it will be converted to plain text.</para>

    </sect2>