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Re: I-D Action:draft-klensin-rfc2821bis-10.txt

2008-04-15 11:50:26

Hi Arnt,
At 10:01 15-04-2008, Arnt Gulbrandsen wrote:
However, I think 2821bis needs a little extra text to notify operators that they may need to upgrade or reconfigure to comply with 2821bis. For example bs.jck.com currently refuses mail from AAAA-only addresses:

There's nothing wrong with that if the host is only IPv4 aware. The IPv6-only sender would be connecting to the IPv6 relay for that domain to send mail as follows:

MAIL FROM:<test(_at_)ipv6(_dot_)l(_dot_)google(_dot_)com>
250 OK
RCPT TO:<jklensin(_at_)jck(_dot_)com>
250 Accepted

Exim users can comply by disabling the sender_verify variable, postfix users can disable reject_unknown_sender_domain, I don't know the relevant variable for any other MTAs.

That might cause more problem than it solves.

Regards,
-sm