On 3 jul 2008, at 15:57, Jeroen Massar wrote:
Which (autoconfig) you should either not be using on servers, or you
should be configuring your software properly to select the correct
outbound address.
Is it the IETF's job to tell people how to run their networks?
In my opinion, stateless autoconfig is a perfectly acceptable way to
configure servers.
SMTP shows that it is perfectly usable for these situations as it
nicely rejects the message with a proper message automatically
telling you on how to solve it.
I ran into the issue with the non-existant IPv6 reverse mapping twice.
I would prefered to have solved this by getting proper delegation from
my ISP, but I haven't been able to get this done for years.
Anyway, the first time I opened a ticket they told me it was fixed.
Then the problem returned and they told me I was put on a whitelist.
As this thread indicates, that's hardly a solution, especially since I
was unable to get Sendmail to NOT use IPv6 without completely
disabling the protocol on my system, making it completely impossible
for me to deliver mail to the IETF servers. (Serves me right for
running Sendmail I guess.)
Those boxes are not set up correctly thus should not be sending
email in the first place. For that matter you should actually be
firewalling+logging port 25 outbound so you can monitor any host in
your network doing illegal SMTP connects.
In my opinion, filtering at layer 4 because a layer 7 protocol is
broken is a bad idea.
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