Mention throttle setting impacts attachment size limit.

en_US/howto/1-change.mail.attachment.size.md

@@ -56,14 +56,33 @@ __NOTES__:
 If you use mail clients such as Outlook, thunderbird to send mails, it's now
 ok to sent large attachment with above setting.
 
+## Change message size limit in iRedAPD
+
+> * iRedAPD is a Postfix policy server developed and maintained by iRedMail team.
+> * With default iRedMail setting, no message size limit is set.
+> * For more details, please check tutorial: [Manage iRedAPD](./manage.iredapd.html).
+
+With plugin `throttle` enabled in iRedAPD config file (`/opt/iredapd/settings.py`),
+iRedAPD will query throttle settings from SQL database (SQL table `iredapd.throttle`),
+if there's a global, per-domain or per-user message size limit set for sender
+or recipient, it will performs the check.
+
+Both Postfix and iRedAPD check the size of single message, if the message size reaches
+the limit of either Postfix setting or iRedAPD throttle setting, the email will
+be rejected.
+
+You can set the throttle with iRedAdmin-Pro, or with SQL command tool, for more
+details, please check plugin source file, it's detailed with examples and
+explanation: [Throttle plugin](https://bitbucket.org/zhb/iredapd/src/default/plugins/throttle.py).
+
 ## Change upload file size in Roundcube webmail
 
 If you have Roundcube webmail, please change two more settings:
 
-### Change PHP setting to allow to upload large attachment
+### Change PHP settings for uploading large attachment
 
 You should change `memory_limit`, `upload_max_filesize` and `post_max_size` in
-PHP config file `/etc/php.ini`
+PHP config file `/etc/php.ini`.
 
 * on RHEL/CentOS: it's `/etc/php.ini`
 * on Debian/Ubuntu, it's `/etc/php5/apache2/php.ini`.

en_US/howto/manage.iredapd.md

@@ -10,9 +10,11 @@
 ## Introduce iRedAPD
 
 iRedAPD is a simple Postfix policy server, written in Python, with plugin
-support. it listens on port `7777` by default, and runs as a low-privileged
+support. It listens on `127.0.0.1:7777` by default, and runs as a low-privileged
 user `iredapd`.
 
+Source code is hosted on [BitBucket](https://bitbucket.org/zhb/iredapd/).
+
 ## How to disable iRedAPD service
 
 To disable iRedAPD service:

html/change.mail.attachment.size.html

@@ -24,8 +24,9 @@
 <ul>
 <li><a href="#change-mail-attachment-size">Change mail attachment size</a><ul>
 <li><a href="#change-message-size-limit-in-postfix">Change message size limit in postfix</a></li>
+<li><a href="#change-message-size-limit-in-iredapd">Change message size limit in iRedAPD</a></li>
 <li><a href="#change-upload-file-size-in-roundcube-webmail">Change upload file size in Roundcube webmail</a><ul>
-<li><a href="#change-php-setting-to-allow-to-upload-large-attachment">Change PHP setting to allow to upload large attachment</a></li>
+<li><a href="#change-php-settings-for-uploading-large-attachment">Change PHP settings for uploading large attachment</a></li>
 <li><a href="#change-roundcube-webmail-settings-to-allow-large-attachment">Change Roundcube webmail settings to allow large attachment</a></li>
 </ul>
 </li>
@@ -85,11 +86,29 @@ attachment.</p>
 </ul>
 <p>If you use mail clients such as Outlook, thunderbird to send mails, it's now
 ok to sent large attachment with above setting.</p>
+<h2 id="change-message-size-limit-in-iredapd">Change message size limit in iRedAPD</h2>
+<blockquote>
+<ul>
+<li>iRedAPD is a Postfix policy server developed and maintained by iRedMail team.</li>
+<li>With default iRedMail setting, no message size limit is set.</li>
+<li>For more details, please check tutorial: <a href="./manage.iredapd.html">Manage iRedAPD</a>.</li>
+</ul>
+</blockquote>
+<p>With plugin <code>throttle</code> enabled in iRedAPD config file (<code>/opt/iredapd/settings.py</code>),
+iRedAPD will query throttle settings from SQL database (SQL table <code>iredapd.throttle</code>),
+if there's a global, per-domain or per-user message size limit set for sender
+or recipient, it will performs the check.</p>
+<p>Both Postfix and iRedAPD check the size of single message, if the message size reaches
+the limit of either Postfix setting or iRedAPD throttle setting, the email will
+be rejected.</p>
+<p>You can set the throttle with iRedAdmin-Pro, or with SQL command tool, for more
+details, please check plugin source file, it's detailed with examples and
+explanation: <a href="https://bitbucket.org/zhb/iredapd/src/default/plugins/throttle.py">Throttle plugin</a>.</p>
 <h2 id="change-upload-file-size-in-roundcube-webmail">Change upload file size in Roundcube webmail</h2>
 <p>If you have Roundcube webmail, please change two more settings:</p>
-<h3 id="change-php-setting-to-allow-to-upload-large-attachment">Change PHP setting to allow to upload large attachment</h3>
+<h3 id="change-php-settings-for-uploading-large-attachment">Change PHP settings for uploading large attachment</h3>
 <p>You should change <code>memory_limit</code>, <code>upload_max_filesize</code> and <code>post_max_size</code> in
-PHP config file <code>/etc/php.ini</code></p>
+PHP config file <code>/etc/php.ini</code>.</p>
 <ul>
 <li>on RHEL/CentOS: it's <code>/etc/php.ini</code></li>
 <li>on Debian/Ubuntu, it's <code>/etc/php5/apache2/php.ini</code>.<ul>

html/manage.iredapd.html

@@ -58,8 +58,9 @@ web-based admin panel - <a href="https://www.iredmail.org/admin_panel.html">iRed
 </div>
 <h2 id="introduce-iredapd">Introduce iRedAPD</h2>
 <p>iRedAPD is a simple Postfix policy server, written in Python, with plugin
-support. it listens on port <code>7777</code> by default, and runs as a low-privileged
+support. It listens on <code>127.0.0.1:7777</code> by default, and runs as a low-privileged
 user <code>iredapd</code>.</p>
+<p>Source code is hosted on <a href="https://bitbucket.org/zhb/iredapd/">BitBucket</a>.</p>
 <h2 id="how-to-disable-iredapd-service">How to disable iRedAPD service</h2>
 <p>To disable iRedAPD service:</p>
 <ol>