LinuxQuestions.org - Block mail service & kernel bit

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Block mail service & kernel bit

Dear Friends ,
I have some follwing questions :

1) is it possible to restrict a service / service port against a user .

I want a situation where in my mail server , all user cannot use my mail service . I need to restrict user ... How can I do this . Here I mention that all user of my server locates in /home directory . I m using Linux RHEL 4 server .

2) I want to know the kernel bit , is it either 64 or 86 bit ? using which command I can get the result ? In the present time which kernel bit Linux is used ?

waiting for ur kind reply .. ..

uname -a will show which kernel you are currently running, including architecture.

Depending on the mail server, you could place individual restrictions (such as requiring authentication, only allowing certain users, etc.)