[support] Input filter for URL's delimited with chevrons <http://example.com/>

Drupal: I receive e-mail newsletters and post them into my Drupal sites. I have configured my e-mail client (Outlook) to display messages in plain text format. Several of the newsletters contain URL's delimited with chevrons: <http://example.com/> I use the "Filtered HTML" input filter on my Drupal sites, set to "Strip disallowed tags". So, Drupal strips out URL's in the above format. I would like Drupal to recognize the URL and display it as a clickable link. As there is no HTML tag "http", I am not inclined to try adding it to the "Allowed HTML tags" list. What is the best way to deal with this issue? TIA, David