Hi. Am Montag 20 Dezember 2010, 12:25:38 schrieb Alessandro Vesely: > On 18/Dec/10 16:06, Bernd Wurst wrote: > > As courier always prefers IPv4 (why?), I set a custom route in > > esmtproutes: mehl.schokokeks.org: [2a01:4f8:121:1ffe::2] > May I ask whether you experience any deliverability differences using > IPv6 for outbound mail?
Well, as courier seems to prefer IPv4 if a host name has both records and no real domain has IPv6-only connectivity, I do not really have outbound connections. I did not find any in my logs recently, apart from the one I stated in my first post. :) But most other system services (Jabber, SSH, FTP) and client-side e-mail connections usually prefer IPv6 if both connections are available. And I'm happy to see that there is some traffic on our IPv6 interface. > I see people wondering about how to run DNSBLs on IPv6, and think > currently there is actually not much --possibly not even spam-- using > such transport for relaying. > > http://blog.teamlazerbeez.com/2009/09/14/email-on-ipv6/ assert that > some 1.9% sampled domains have one or more MX records with at least > one host on IPv6. Are there more recent stats? In Germany, the biggest ISP for end users (T-Online) recently announced that they are planning to provide native IPv6 on all DSL connections during 2011. So, german data center companies start offering IPv6 from now on to be prepared for this. I think that IPv6 traffic will start growing during the next year but at the moment, it's at very low level (I don't have stats, just my opinion). DNSBLs should not be necessary now, I think that nowadays most spam is sent via poorly maintained systems and those admins will not implement IPv6 too soon. Bernd
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