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Issues in SMTP over IPv4/v6 


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Kazuhiko Yamamoto
WIDE Project
v6@wide.ad.jp

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http://www.v6.wide.ad.jp/
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Toward SMTP over IPv4/v6

	IPv4/v6 MTAs -- patches are ready
	IPv4/v6 MUAs -- almost okay (pop6)

	Impact of 
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"IN AAAA" 
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record on DNS database, to legacy MTAs/DNS servers

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Experiment

	Asked to send test emails toward the following address, to public

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To: test@a.v6.wide.ad.jp
To: test@b.v6.wide.ad.jp

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a.v6.wide.ad.jp. IN A 203.178.137.73
a.v6.wide.ad.jp. IN AAAA 3ffe:0501:1000::1

b.v6.wide.ad.jp. IN MX 10 c.v6.wide.ad.jp.
b.v6.wide.ad.jp. IN MX 20 a.v4.wide.ad.jp.

c.v6.wide.ad.jp. IN AAAA 3ffe:0501:1000::1
c.v4.wide.ad.jp. IN A 203.178.137.73

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Results

	1380 emails sent from 1256 subdomains
		33 emails are with invalid From: field

	2 "MX loopback to myself" error
		(due to senders' misconfiguration?)
	1 "no route to host" error
		(due to old named - 4.8.3)

	Old softwares are not happy with AAAA
		Sendmail before x.x.x
		bind before x.x.x

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What should we do now

	Let people know the problem
		Senders must update their software
		Informational document -> to be done

	For safety, use "v6" prefix in domain name for experiment
		v6.wide.ad.jp
