CiviMail does not correctly rewrite some URLs for tracking

I currently use CIviCRM 3.3.2 with Joomla.

Due to how Joomla generates URLs from article titles by replacing whitespaces with dashes, some of the links we embed in our newsletters end with dashes, and these links get mangled by CiviMail's rewriting.

For example, the following HTML:

<p><a href="http://yoursdp.org/index.php/news/singapore/4470-sdp-proposes-alternative-ns-policy-" target="_blank">Read more</a></p>
<p><a href="http://yoursdp.org/index.php/news/singapore/4470-" target="_blank">Read more</a></p>

gets rewritten as:

<p><a http://yoursdp.org/administrator/components/com_civicrm/civicrm/extern/url.php?u=166&qid=31593-" target="_blank">Read more</a></p>
<p><a http://yoursdp.org/administrator/components/com_civicrm/civicrm/extern/url.php?u=169&qid=31593-" target="_blank">Read more</a></p>

This can be easily worked around by removing trailing dashes since Joomla ignores them.