How to prevent that sbs 2011 communicate with the internet on ipv6 protocol for smtp

Hallo,

I want to sent a email to Gmail account i receive everytime this error message from mx.google.

--[------ Oorspronkelijk bericht --------]
Van: Microsoft Outlook <MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@kantoorgevaert.be>
Datum: 08-01-2016 08:16 (GMT+01:00)
Aan: Microsoft Outlook <MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@kantoorgevaert.be>
Onderwerp: Onbestelbaar: Fw: Verlichting b-terrein
mx.google.com heeft uw bericht voor de volgende e-mailadressen geweigerd:
Johan Van den Bossche (bossiesabrina@gmail.com)
mx.google.com gaf deze fout:
[2a02:a018:203:1800:b41a:da6d:522f:666] Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication. Please review https://support.google.com/mail/?p=ipv6_authentication_error for more information. ko8si163220171wjb.26 - gsmtp ]

My provider (proximus) don't support for the moment Ipv6 PTR adressing
is their another solution ?

Thanks,

Lode
LDecockAsked:
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bas2754Commented:
The best way we have found is to put a firewall in place between the SBS server and the Provider equipment (in our case it was Comcast).  We then disabled Ipv6 on the firewall and now no more errors from google since it can only communicate on Ipv4.

I think Google was premature in their implementation of these protections, however at the same time if providers are going to offer it, they should also be ready to facility static address if needed for instances like this.  Problem is Ipv6 addresses are so plentiful, that it really will be hard for ISP's to charge the premium they are right now for Ipv4 addresses.

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