Hello,

I want to filter, secure 110 with authentication, open 25 only to relayable
hosts, drop all other trying access 25, domain blocking is not my intend,
because blacklists have more
disadvantages than the right affect on security.

Axel

> Why would you use iptables for that? Reasonable MTAs nowadays have
> a feature which honors blacklists.
> If you want to do the blocking yourself you will need some script
> or whatever to collect the IP addresses of spamming hosts - and the
> tricky part will be how you know IN ADVANCE if a host will spam you ;-)
> By uing blacklists your can increase your chance because a spamming
> host will mabye already make it into the blacklist database bofore
> he attempts to spam you.
>
> Hope I made sense ;-)
>
> Erwin
>
> ---
> Axel Leitner wrote:
>
> > Hello everybody,
> >
> > has someone a suggestion how to block unauthorizied spam access with an
> > iptables rule thru 25/tcp ?
> >
> > Bye
> >
> > Axel
> >
> >
> >
>
>
> --
> Erwin Zierler | web- / host- / postmaster - stubainet.at
> | erwin.zierlerstubainet.at / webmasterstubainet.at
> | Tel.: 0 5225 - 64325 Fax 99 Mobil: 0664 - 130 67 91
>
>
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>

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