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Date:      Sun, 24 Mar 2013 12:01:11 -0400 (EDT)
From:      Daniel Feenberg <feenberg@nber.org>
To:        Doug Hardie <bc979@lafn.org>
Cc:        "freebsd-questions@freebsd.org List" <freebsd-questions@freebsd.org>
Subject:   Re: Client Authentication
Message-ID:  <Pine.GSO.4.64.1303241157190.22196@nber6>
In-Reply-To: <8680FAB3-4943-4F91-935B-E11511C3FD4E@lafn.org>
References:  <B2DC7342-9F1A-489A-94F0-49802B1E5DF6@lafn.org> <CAOgwaMvu+OC4PiPfNNwoj7aB+631Nt_=SwjFG9y89+avB6Mp9Q@mail.gmail.com> <8680FAB3-4943-4F91-935B-E11511C3FD4E@lafn.org>

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On Sat, 23 Mar 2013, Doug Hardie wrote:

>
> On 23 March 2013, at 21:51, Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> wrote:
>
>>
>> Using Static IP in the client side , and checking Static IP of the user 
>> may be a possibility : In that way , any message from another IP will 
>> not be accepted .
>>
>> If this is possible for your systems , it may be checked for usability 
>> .
>>
>> One difficulty is that each user should obtain a Static IP and can not 
>> connect to his/her ISP from another IP .
>>
>> Good side is that nobody can connect to ISP of the user from another IP 
>> : It supplies hardware security ( we are assuming that the user 
>> computer is not captured ) ..
>
> That is an interesting idea, but unfortunately our users tend to travel 
> a lot and need to be able to access mail from anywhere.  Also, static 
> IPs can get quite expensive from some ISPs.  Our users are pretty much 
> on fixed incomes and any expense is a hardship for them.

Can you filter outgoing mail with Spamassassin? How about refusing to 
relay mail from addresses in a good DNSBL? Do you rate-limit outgoing
mail? Can you just refuse to relay mail from other continents, using
a geolocation service?

daniel feenberg

>
> -- Doug
>
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