[Mimedefang] Black Listed
Daniel Taylor
dtaylor at vocalabs.com
Wed Apr 7 07:53:24 EDT 2004
Andrea Venturoli wrote:
> ** Reply to note from WBrown at e1b.org Tue, 6 Apr 2004 15:10:33 -0400
>
>
>
>>>>My ISP here (Bigpond) is about to implement blocking port 25 for all
>>
>>their
>>
>>>>dynamic IP customers.
>>>
>>>
>>>Good! That's ok with me, as soon as their smtp server, which I'm
>>>then forced to use is not blacklisted!
>>
>>
>>This would not be acceptable to me at home on my cable modem. I only use
>>my cable modem ISP for transport only. My mail accounts require
>>authentication before I can relay off them. If I relay through an
>>Adelphia server, but have a StumpyDogs.org or RVClub.net address on the
>>email, that could look like a forgery.
>
>
> There could be workarounds.
> Like for example allowing connection to outside servers on port 587, which should be authenticated.
SPF can help here. I have mx:mn.rr.com set for argle.org so that
receiving mailservers know that argle.org e-mail can originate from
RoadRunner's servers legitimately. Port 587 should only be used for
authenticated submissions to keep from being an open relay.
--
Daniel Taylor VP Operations Vocal Laboratories, Inc.
dtaylor at vocalabs.com http://www.vocalabs.com/ (952)941-6580x203
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