First things first!
Quote:
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i want to block Webmail attachment i dont have any mail server
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doesn't really describe the problem you're trying to solve.
So first write what mail do you want to block ?
- is it your server a 'relay' for sending emails to the internet
- are you receiving emails with attachments that you want to block
- what user accounts (email acc.) possibly you have on your server you want to block emails (or is it just you as 'root')
- what is the MTA on your server (postfix, sendmail ...)
Whether you ask your question the right way it's possible you will get the answer.
