How will I restrict incoming mails from specific users in Unix?

[Minal Silimkar-Urankar]

I want to restrict specific users mail on Unix or Linux operating system. How will I do it?

[Pat Farrell]

What exactly are you trying to do? Are you asking how to setup your mail client software to "junk" mail from a specific user? or perhaps, are you asking how to setup your SMTP server to reject email from a specific user? They are very different problems, with completely different solutions.

If you are trying to configure your mail client, what client are you using?

if you are trying to configure your SMTP server, what server are you using?