How do i stop mails generated by email spoof ?

Dear Sir,
There is no real way to stop spoofing except to delete the messages as they arrive. To accomplish this, you can simply define a filter that will delete messages based on specific values in the email message header. In our case, we set the header to delete messages sent from the MAILER-DAEMON address.
If you need to handle a specific type of e-mail message in a special way, you may want to customize some message filters on Outlook. This will ensure that messages tagged as an example: "SPOOF" will be placed in your junk mail folder.  

1.     Open Outlook and Click on the Tools drop down menu and select Rules and Alerts ...
2.     In the window that opens, click on the New Rule... button.
3.     In the Rules Wizard dialogue box, under Step 1: Select a template, select Move messages with specific words in the subject to a folder.
4.     Under Step 2, click on the blue, underlined phrase, specific words.
5.     In the window that opens, type the words (example: "Spoof") in the text box at the top.
6.     Click Add.
7.     The new search criterea will appear under Search list:. Click OK.
8.     Under Step 2, click the blue, underlined word, specified.
9.     Select Junk E-mail and click OK.
10.   Click Finish.
11.   Click OK to enable this rule for all future mail handling.

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Dear Ahmed,

Thanks for your help. But I look at it as a work-aroud and not a solution. I beleive there has to be some solution for this problem. My worry is that today i am facing this issue with one id in my organisation, tomorrow if it happens with others then my mail flow will definately affected.