Inspite of Marking as SPAM the mail from same sender or Email address from adifferent sender keeps comming.?

Answer 1

To block an address as spam or just to block annoying e-mails follow these steps:

# [1] Instructions: Yahoo! Mail Beta:
→ Log in to your Yahoo! account
→ Go to your Inbox and select the e-mail which came from the address you want to block
→ After you have selected the message, click Spam.
.... This should do it, if not then follow the number [3] instructions]

# [2] Instructions: Yahoo! Mail old version:
→ Log in to your Yahoo! account
→ Go to your Inbox and select the e-mail which came from the address you want to block
→ Above is a small "toolbar" and click Mark as Spam

# [3] Instructions: These instructions are for any version of Yahoo! Mail:
→ Log in to your Yahoo! account
→ On your upper-right hand, click Options
→ Under Spam section, click on Spam Protection
→ Under Hamlet select both boxes

These steps will do it :)

Answer 2

The filters arent perfect, just mark it as spam again.