<HTML>
<HEAD>
<TITLE>MHonArc FAQ: MIME</TITLE></HEAD>
<link rel="stylesheet" type="text/css" href="../docstyles.css">
<BODY>
<!--X-NavButtons-Start-->
<table width="100%"><tr><td align="left"><nobr>[<a href="threads.html">Prev</a>]</nobr></td><td align="center" width="100%">[<a href="faq.html">TOC</a>][<a href="../mhonarc.html">Manual</a>][<a href="http://www.mhonarc.org/">Home</a>]</td><td align="right"><nobr>[<a href="security.html">Next</a>]</nobr></td></tr></table>
</p>
<!--X-NavButtons-End-->
<!-- ===================================================================== -->
<HR>
<H2><a name="mime">MIME</a></H2>
<!--X-TOC-Start-->
<ul>
<li><a href="#whatismime">What is MIME?</a></li>
<li><a href="#nonascii">Does MHonArc support message header extensions for non-ASCII text?</a></li>
<li><a href="#howtorecog">How can I get MHonArc to recognize content-types it states it does not recognize?</a></li>
<li><a href="#overridedefs">Can I override the default filters in MHonArc?</a></li>
<li><a href="#overridemulti">Can I override the multipart/* processing of MHonArc?</a></li>
<li><a href="#badtype">Why are attachments saved as a ".bin" files?</a></li>
<li><a href="#filenames">Can attachments get saved with the filename specified in the message header?</a></li>
<li><a href="#removepre">Can the <PRE> tags be removed from converted messages?</a></li>
<li><a href="#lineclip">Can long lines be wrapped in converted messages?</a></li>
<li><a href="#exclude">Can I exclude specific media-types?</a></li>
<li><a href="#alternative">Can I tell MHonArc to use the text/plain part over a text/html part in a multipart/alternative message?</a></li>
<li><a href="#excattach">How do I exclude attachments from my archives?</a></li>
</ul>
<!--X-TOC-End-->
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="whatismime">What is MIME?</a></b></h3>
</td></tr></table>
<P>MIME stands for <EM>Multipurpose Internet
Mail Extensions</EM>.
An HTML version of the RFCs that define MIME are available at (<A
HREF="http://www.mhonarc.org/~ehood/MIME/">http://www.mhonarc.org/~ehood/MIME/</A>).
</P>
<P>In sum, MIME "redefines the format of message bodies to
allow multi-part textual and non-textual message bodies to
be represented and exchanged without loss of information." [<A
HREF="http://www.mhonarc.org/~ehood/MIME/1521/rfc1521ToC.html">RFC 1521</A>]
</P>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="nonascii">Does MHonArc support message header extensions for non-ASCII text?</a></b></h3>
</td></tr></table>
<P>v2.0 or later. Review the <a href="../resources/charsetconverters.html">CHARSETCONVERTERS</a> resource page for
which character sets are supported by MHonArc and how to extend
MHonArc to support other character sets.
</P>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="howtorecog">How can I get MHonArc to recognize content-types it states it does not recognize?</a></b></h3>
</td></tr></table>
<P>This question can be answered by reading about the <a href="../resources/mimefilters.html">MIMEFILTERS</a>
resource of the
MHonArc documentation. The solution may require registering
a pre-existing filter for the given content-type, or hooking in a
new filter.
</P>
<table class="note" width="100%">
<tr valign="baseline">
<td><strong>NOTE:</strong></td>
<td width="100%"><p>MHonArc treats unknown content-types as
<tt>application/octet-stream</tt> for purposes of filtering.
</p>
</td>
</tr>
</table>
<p>
</p>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="overridedefs">Can I override the default filters in MHonArc?</a></b></h3>
</td></tr></table>
<p>Yes. MHonArc's default filters are hooked in
as described in the <a href="../resources/mimefilters.html">MIMEFILTERS</a> resource. Note, please review the
options available for the default filters described in the <a href="../resources/mimefilters.html">MIMEFILTERS</a>
resource page since they may already provide the capabilities you
need.
</p>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="overridemulti">Can I override the multipart/* processing of MHonArc?</a></b></h3>
</td></tr></table>
<p>Yes, but not recommended. Make sure you are familiar with how
MHonArc does things before considering implementing your own multipart
filter. In sum, you can completely replace MHonArc's filters
with your own if you so desire.
</p>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="badtype">Why are attachments saved as a ".bin" files?</a></b></h3>
</td></tr></table>
<p>MHonArc uses the <b>Content-Type</b> field in messages to determine
the type of data that is being processed. If data is gettings saved
to a "<tt>.bin</tt>" file, it means the data has a content-type of
<b>application/octet-stream</b>. The best solution to the problem
is have the senders of the messages label the data properly. You
can also check out the <b><tt>m2h_external::filter</tt></b> options documented
in the <a href="../resources/mimefilters.html">MIMEFILTERS</a> page of the documentation for some alternate
solutions.
</p>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="filenames">Can attachments get saved with the filename specified in the message header?</a></b></h3>
</td></tr></table>
<p>Yes. See the <b><tt>m2h_external::filter</tt></b> options documented
in the <a href="../resources/mimefilters.html">MIMEFILTERS</a> page of
the documentation. <strong>Make note of the
security cautions</strong> in the documentation.
Example:
</p>
<pre class="code">
<b><MIMEArgs></b>
m2h_external::filter; usename
<b></MIMEArgs></b>
</pre>
<dl>
<dt>See also:</dt>
<dd><a href="security.html#attachments"
>Why doesn't MHonArc, by default, use the specified filename when
saving attachments?</a></dd>
</dl>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="removepre">Can the <PRE> tags be removed from converted messages?</a></b></h3>
</td></tr></table>
<p>Yes. See the options available for the <b>m2h_text_plain::filter</b>
described in the <a href="../resources/mimefilters.html">MIMEFILTERS</a> resource page of the documentation.
Example:
</p>
<pre class="code">
<b><MIMEArgs></b>
m2h_text_plain::filter; nonfixed
<b></MIMEArgs></b>
</pre>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="lineclip">Can long lines be wrapped in converted messages?</a></b></h3>
</td></tr></table>
<p>Yes. See the options available for the <b>m2h_text_plain::filter</b>
described in the <a href="../resources/mimefilters.html">MIMEFILTERS</a> resource page of the documentation.
Example:
</p>
<pre class="code">
<-- Make sure lines are no longer than 80 characters -->
<b><MIMEArgs></b>
m2h_text_plain::filter; maxwidth=80
<b></MIMEArgs></b>
</pre>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="exclude">Can I exclude specific media-types?</a></b></h3>
</td></tr></table>
<p>Yes. See the <a href="../resources/mimeexcs.html">MIMEEXCS</a> resource.
Example:
</p>
<pre class="code">
<-- Exclude all HTML and binary data -->
<b><MIMEExcs></b>
text/html
application/octet-steam
<b></MIMEExcs></b>
</pre>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="alternative">Can I tell MHonArc to use the text/plain part over a text/html part in a multipart/alternative message?</a></b></h3>
</td></tr></table>
<p>Yes, in v2.5.8, and later, via the <a href="../resources/mimealtprefs.html">MIMEALTPREFS</a> resource.
Example:
</p>
<pre class="code">
<b><MIMEAltPrefs></b>
text/plain
text/html
<b></MIMEAltPrefs></b>
</pre>
<!-- ??????????????????????????????????????????????????????????????? -->
<hr noshade size=1>
<table border=0>
<tr valign=baseline><td><img src="monicon.png" align="bottom" alt=""></td><td>
<h3><b><a name="excattach">How do I exclude attachments from my archives?</a></b></h3>
</td></tr></table>
<p>See the following archived message to the
<a href="http://www.mhonarc.org/archive/html/mhonarc-users/">mhonarc-users</a>
list:
<em><a href="http://www.mhonarc.org/archive/cgi-bin/mesg.cgi?a=mhonarc-users&i=200506022248.j52MmI023208%40gator.earlhood.com">Re: Disabling attachments</a></em>.
</p>
<table class="note" width="100%">
<tr valign="baseline">
<td><strong>NOTE:</strong></td>
<td width="100%"><p>The
<a href="../resources/mimeincs.html">MIMEINCS</a>
resource mentioned in the list message is available in MHonArc v2.6.12
and later.
</p>
</td>
</tr>
</table>
<p>
</p>
<!-- ===================================================================== -->
<hr>
<!--X-NavButtons-Start-->
<table width="100%"><tr><td align="left"><nobr>[<a href="threads.html">Prev</a>]</nobr></td><td align="center" width="100%">[<a href="faq.html">TOC</a>][<a href="../mhonarc.html">Manual</a>][<a href="http://www.mhonarc.org/">Home</a>]</td><td align="right"><nobr>[<a href="security.html">Next</a>]</nobr></td></tr></table>
</p>
<!--X-NavButtons-End-->
<HR>
<address>
$Date: 2005/06/07 19:17:26 $ <br>
<img align="top" src="monicon.png" alt="">
<a href="http://www.mhonarc.org/"
><strong>MHonArc</strong></a><br>
Copyright © 1997-1999, <a href="http://www.earlhood.com/"
>Earl Hood</a>, <a href="mailto:mhonarc%40mhonarc.org"
>mhonarc<!--
-->@<!--
-->mhonarc.org</a><br>
</address>
</BODY>
</HTML>