-“<span class="quote">E</span>” selects encryption, “<span class="quote">S</span>” selects signing and
-“<span class="quote">S<id></span>” selects signing with the given key, setting
-<a class="link" href="reference.html#pgp-sign-as" title="3.174. pgp_sign_as">$pgp_sign_as</a>
-permanently. The selection can later be changed in the compose menu.
-</p></div><div class="sect3" lang="en" xml:lang="en"><div class="titlepage"><div><div><h4 class="title"><a id="in-reply-to-header"></a>6.2.4. In-Reply-To: Header</h4></div></div></div><p>
-When replying to messages, the <span class="emphasis"><em>In-Reply-To:</em></span> header contains the
-Message-Id of the message(s) you reply to. If you remove or modify its value, Mutt will not generate a
-<span class="emphasis"><em>References:</em></span> field, which allows you to create a new message thread, for example
-to create a new message to a mailing list without having to enter the mailing list's address.
-</p></div></div><div class="sect2" lang="en" xml:lang="en"><div class="titlepage"><div><div><h3 class="title"><a id="sending-crypto"></a>6.3. Sending Cryptographically Signed/Encrypted Messages</h3></div></div></div><p>
-If you have told Mutt to PGP or S/MIME encrypt a message, it will guide you
-through a key selection process when you try to send the message.
-Mutt will not ask you any questions about keys which have a
-certified user ID matching one of the message recipients' mail
-addresses. However, there may be situations in which there are
-several keys, weakly certified user ID fields, or where no matching
-keys can be found.
+<span class="quote">“<span class="quote">E</span>”</span> selects encryption, <span class="quote">“<span class="quote">S</span>”</span> selects signing
+and <span class="quote">“<span class="quote">S<id></span>”</span> selects signing with the given key,
+setting <a class="link" href="reference.html#pgp-sign-as" title="3.175. pgp_sign_as">$pgp_sign_as</a> permanently. The
+selection can later be changed in the compose menu.
+</p></div><div class="sect3" title="6.2.4. In-Reply-To: Header"><div class="titlepage"><div><div><h4 class="title"><a id="in-reply-to-header"></a>6.2.4. In-Reply-To: Header</h4></div></div></div><p>
+When replying to messages, the <span class="emphasis"><em>In-Reply-To:</em></span> header
+contains the Message-Id of the message(s) you reply to. If you remove or
+modify its value, Mutt will not generate a
+<span class="emphasis"><em>References:</em></span> field, which allows you to create a new
+message thread, for example to create a new message to a mailing list
+without having to enter the mailing list's address.
+</p><p>
+If you intend to start a new thread by replying, please make really sure
+you remove the <span class="emphasis"><em>In-Reply-To:</em></span> header in your
+editor. Otherwise, though you'll produce a technically valid reply, some
+netiquette guardians will be annoyed by this so-called <span class="quote">“<span class="quote">thread
+hijacking</span>”</span>.
+</p></div></div><div class="sect2" title="6.3. Sending Cryptographically Signed/Encrypted Messages"><div class="titlepage"><div><div><h3 class="title"><a id="sending-crypto"></a>6.3. Sending Cryptographically Signed/Encrypted Messages</h3></div></div></div><p>
+If you have told Mutt to PGP or S/MIME encrypt a message, it will guide
+you through a key selection process when you try to send the message.
+Mutt will not ask you any questions about keys which have a certified
+user ID matching one of the message recipients' mail addresses.
+However, there may be situations in which there are several keys, weakly
+certified user ID fields, or where no matching keys can be found.