Now Gmail permits you to select more than 50 messages on a single page.
Naturally this makes deleting spams lot easier and you can delete message from a particular person by using Search and Delete method (For example: Search for Dheeraj, and delete all messages from him)
Unfortunately I’ve not seen this feature because I can access only Google Mail.
Screenshot:
Via Google Operating System & Google Blogoscoped
Written by 
wrote, on July 15th, 2006
This is really a great feature, although I use Thunderbird which does an excellent job filtering spam. Google has some amazing things coming down the the line.
wrote, on July 15th, 2006
@Jason: Yup, Thunderbird is my favorite email client