Single Email instead of Multiple Emails from Worklfow

Hi,

I have a scenario in which whenever some leads are assigned to some users.A workflow will run in background which will send emails to the corresponding user.Now for each lead an email will be sent to the user notifying that the lead is assigned to that user.If 20 leads are assigned to the user,20 emails will also be send to the user each containing the data about that specific lead.

I know its kind of difficult but is there some way that instead of sending many emails to the same user,i can manipulate its functionality to send a single email that contains all the necessary data to identify that those leads are assigned to that user.

Any kind of help/suggestion will be appreciated.