wrong URL rendering with a 'URL with trailing space'

When we send a newsletter with a link and that URL has a trailing space (yes, normally it hasn't a trailing space), the link in the received newsletter is misformed.
Example :
If we set a link like this
<a target="_blank" href="http://www.yourdomain.com/a_web_page.html ">link</a>
In the newsletter it wil be transformed into this
<a target="_blank" http://www.yourdomain.com/cms/sites/all/modules/civicrm/extern/url.php?u=214&qid=70774 ">link</a>

It's not really a bug, but this occure in the real world while editors copy/paste url's into the newsletters.
Maybe a good filter/rendering can resolve this problem.