* Bill Cole: > The boutique hosting/connectivity/services provider I work with [...] > can provide native IPv6 to customers. None ever has ever asked for it.
That's quite a sweeping statement, and I don't believe it to be true. For years I have asked every provider I have worked with if they offer native IPv6, and if so in what net blocks etc. Unless you can provide proof, in writing, I simply cannot believe that no customer has ever asked the provider you mentioned for IPv6. > There is at least one large mail system operator (Google) which > explicitly has stricter criteria for accepting mail from IPv6 sources > so maybe you don't even want to ever send on IPv6 anyway to avoid > having to suit them today and a dozen others with different criteria > next week. Google has so far not rejected mail sent by the dual stack servers I maintain, no matter if IPv4 or IPv6 was used. Both DKIM and SPF are configured on my end, which seems to be a major concern for Google, but beyond that I have neither noticed them being overly finicky nor changing criteria often. YMMV. > Does anyone worth worrying about only send or receive on IPv6? Not > that I'm aware of. The operative word being "only". That was indeed what the OP asked about, and I forgot to mention that I too would not run an IPv6-only mail server, same as you. However, your question made me wonder: Is anyone worth worrying about, as you put it, unable to send or receive via IPv6? While the answer is possibly a yes in many cases (it is for me), I don't know how the OP would be affected. > Are there tools for spam control of IPv6 incoming mail that match the > IPv4 tools? Are there specific tools you have in mind which don't have IPv6 support yet? Are the authors aware of that? Also, I look at it this way: Based on my logs the amount of spam attempts, let alone deliveries, via IPv6 appears to be noticeably lower than via IPv4. I mean the ratio of spam to connections, not only the absolute number. I wonder if that indicates that spammers find it difficult to rent/purchase/employ IPv6-capable infrastructure and spam tools? -Ralph
