block message on IP

[Pete]

Bart J. Smit wrote:

> I would like to implement a feedback feature where users can send
> false negatives and positives to a set of mailboxes, say spam and
> nospam. These would be scanned by sa-learn every hour on a cron job.
>
> Of course it is far too easy for a spammer to submit their spam to
> nospam at mailscanner <mailto:nospam at mailscanner> so I want to restrict
> the IP addresses that can submit mail to that box to the mail servers
> where my users are on.
>
> The MailScanner.conf doesn't seem to offer an option for blocking
> messages in a ruleset. The closest I have seen is to block encrypted
> and unencrypted messages on the same ruleset.
>
> Does this indeed block all messages? Is there perhaps an easier way to
> do this in sendmail?
>
> Thanks
>
> Bart...

Tis the job of the MTA to accept or not accept mail based on IP or
address, not mailscanner? Far more efficiant in your case where you will
probably only want 1 or a small amount of subnets/sender domains to be
able to send to it?

What mail system your clients using?