Copy Viola's probrem: (from eMail list discussion)

I can sort list of messages by date, sender and subject (Moodle 1.9). If I sort messages by Course Name I get a new page with a message "No messages to display".

Maybe this helps:

There are the following URLs I get clicking options I can sort by:

by subject:

....../blocks/email_list/email/index.php?id=1&course=1&folderid=0&filterid=0&folderoldid=0&page=0&perpage=10&ssort=subject

by sender:

..../blocks/email_list/email/index.php?id=1&course=1&folderid=0&filterid=0&folderoldid=0&page=0&perpage=10&ssort=writer

by Course:

..../blocks/email_list/email/index.php?id=1&course=1&folderid=0&filterid=0&folderoldid=0&page=0&perpage=10&ssort=icon