Can I keep users from receiving mail from the Internet?

[Nathaniel Hall]

Some spam may be better than a bunch of spam.  I haven't received much 
(if any) mail spoofed with @localhost.

Nathaniel Hall, GSEC
Intrusion Detection and Firewall Technician
Ozarks Technical Community College -- Office of Computer Networking

halln at otc.edu
417-447-7535



Simon Windsor wrote:

> Fedora wrote:
>
>> I'm using sendmail as the MTA and I would like to make it impossible for
>> certain users (root comes to mind, but there are other userids as 
>> well) to
>> receive email from the Internet.
>>
>> I'd like to "block" it, as opposed to having some sort of filter 
>> throw it
>> away after it's arrived.  Ideally, these few userids would appear to be
>> invalid to anyone outside my network.
>>
>> On the other hand ... I do need for all users to be able to receive 
>> email
>> "internally" (i.e., from localhost).
>>
>> In my case, spammers have discovered that there is <gasp!> a "root" user
>> that they can send email to.
>>
>> Any thoughts?
>>
>> Thanks much,
>> Charlie
>>
>>  
>>
> Hi
>
> A solution to this may be to use forward files.
>
> One possible drawback though is some spam spoofs @localhost,.
>