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<title>The Exim FAQ Section 9</title>
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<h1>The Exim FAQ</h1>
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<h2><a href="FAQ.html#TOC283">9. HEADERS</a></h2>
<p>
<a name="TOC284" href="FAQ.html#TOC284">Q0901:</a> I would like add some custom headers to selected outgoing mail based on
a specific domain and the subject line.
</p>
<p>
<font color="#00BB00">A0901:</font> To the remote_smtp transport, add something like
</p>
<pre>
headers_add = ${if and{\
{eq{$domain}{spec.dom}}\
{matches{$h_subject:}{whatever}}}\
{Content-Type: text/html; charset="us-ascii"} fail }</pre>
<p>
This example shows a <i>Content-Type:</i> header, but you can have anything you
like, and multiple headers can be inserted by using <tt>\n</tt> to separate them.
</p>
<p>
<a name="TOC285" href="FAQ.html#TOC285">Q0902:</a> Is it possible to have Exim add a header to only certain local parts of
outgoing mail?
</p>
<p>
<font color="#00BB00">A0902:</font> Only if you arrange for each such local part to receive its own private
copy of the mail. See <tt>max_rcpt</tt> in the SMTP transport. If you set this
to 1, you could use conditions in an expansion string to add or not add
a header.
</p>
<p>
<a name="TOC286" href="FAQ.html#TOC286">Q0903:</a> How can I remove some part of the <i>Received:</i> header?
</p>
<p>
<font color="#00BB00">A0903:</font> Set <tt>received_header_text</tt>.
</p>
<p>
<a name="TOC287" href="FAQ.html#TOC287">Q0904:</a> How I can insert the PGP header line using Exim filters?
</p>
<p>
<font color="#00BB00">A0904:</font> You can't insert headers in a user filter. A system filter can do so,
but the inserted lines then are included for all recipients.
</p>
<p>
<a name="TOC288" href="FAQ.html#TOC288">Q0905:</a> I know I can use a system filter to replace certain headers in messages,
but how can I add text to existing headers? I want to add [SPAM] to
the subject line of messages that appear to be spam.
</p>
<p>
<font color="#00BB00">A0905:</font> You can only do this in a round about way, using filter commands like
this:
</p>
<pre>
headers add "New-Subject: SPAM: $h_subject:"
headers remove subject
neaders add "Subject: $h_new-subject:"
headers remove new-subject</pre>
<p>
This trick works only in system filters, where the commands are obeyed
in order, and affect the master list of headers that apply to the whole
message. You cannot do this with the <tt>headers_add</tt> and <tt>headers_remove</tt>
options on drivers.
</p>
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