change your email password
Login your yahoo mail/beta
click on options > mail options
Click on Account Information
(you will be asked to enter your password)
Your Yahoo ID card will open
Click on change password.
Enter the current password and the new twice.
Click on Save Button
click on Finished Button to Exit.
create filters.
In yahoo mail go to
options > mail options > Filters
Click on Add button to set a filter.
Give a name to your filter.
You can create filters for the subject text that you receive often. For example if you are receiving mail having mailer daemon in the subject line.
Then Add mailer daemon in the text box in front of
Text-contains- type mailer daemon here
Leave the match case unchecked.
There are also filter options for checking words in header, body, of mail.After that decide where the mail will go. In your case select the folder named trash as below.
Then-Move The message To-select trash from the list.
Press Add Filter button when done.
You can set as many as 15 filters in yahoo mail.