Looking for a Microsoft person who can help w/ v6 and Office365 email

Ted Mittelstaedt tedm at ipinc.net
Wed Apr 22 18:23:04 CEST 2015

There is an RFC:


Section 1.2.2 Robustness Principle


On 4/22/2015 8:40 AM, Frank Bulk wrote:
> Glad to hear that Microsoft did this on their O365 platform.
> Is there an RFC or other standard that we can point other email 
> providers to about implementing email admission in this manner?
> Frank
> *From:*ipv6-ops-bounces+frnkblk=iname.com at lists.cluenet.de 
> [mailto:ipv6-ops-bounces+frnkblk=iname.com at lists.cluenet.de] *On 
> Behalf Of *Bill Owens
> *Sent:* Wednesday, April 22, 2015 8:08 AM
> *To:* ipv6-ops at lists.cluenet.de
> *Subject:* Re: Looking for a Microsoft person who can help w/ v6 and 
> Office365 email
> On Wed, Apr 1, 2015 at 8:02 PM, Bill Owens <owens.bill at gmail.com 
> <mailto:owens.bill at gmail.com>> wrote:
> >
> > We've been running our Office365 mail account for a few weeks now 
> with IPv6 enabled. We went into this knowing that Microsoft was going 
> to enforce SPF checks on inbound mail, and we've run into a number of 
> issues with people sending mail over v6 transport and having bad SPF 
> records (or none). So far we've been able to resolve all but one of 
> those issues, or are in the process of doing so; that's not a big 
> deal. The one that won't fix their record is going to require us to 
> resubscribe to a few mail lists, not the end of the world.
> >
> > However, we've discovered that there are sporadic failures even when 
> there are valid SPF records, and in some cases even when the email 
> enters the Microsoft 'world' using v4 and transitions to v6 between 
> two Microsoft servers - at which point the SPF check is applied even 
> though the message was "accepted" several hops prior, and the check 
> sometimes fails. That's something we can't fix on our own.
> >
> I don't know whether this is in response to the problems we've 
> reported, but Microsoft has changed their attitude towards SPF and
> IPv6 just a little. Rather than returning a 5xx error code, which 
> causes the mail to bounce immediately, they're going to return 4xx
> and allow the sender to attempt redelivery. This ought to prevent the 
> majority of bounces that we've been seeing, although it
> doesn't fix the underlying issue(s) that cause the false SPF failures:
> http://blogs.msdn.com/b/tzink/archive/2015/04/18/office-365-will-slightly-modify-its-treatment-of-anonymous-inbound-email-over-ipv6.aspx
> Bill.
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