These are AAAA attempts from our logs (we use IPv6 for inbound/outbound) 2a01:111:f400:7d00::33 2a01:111:f400:7e1a::33 2a01:111:f400:7e1b::33 2a01:111:f400:7e88::33 2a01:111:f400:7e89::33 2a01:111:f400:7e8a::33 2a01:111:f400:7e8b::33 2a01:111:f400:7e8d::33 2a01:111:f400:7ea9::33 2a01:111:f400:7eaa::33 2a01:111:f400:7eab::33 2a01:111:f400:7eae::33 2a01:111:f400:7eaf::33 2a01:111:f400:fe02::33 2a01:111:f400:fe06::33 2a01:111:f400:fe07::33 2a01:111:f400:fe0c::33 2a01:111:f400:fe0d::33 2a01:111:f400:fe0e::33 2a01:111:f400:fe0f::33 2a01:111:f400:fe10::33 2a01:111:f400:fe11::33 2a01:111:f400:fe12::33 2a01:111:f400:fe16::33 2a01:111:f400:fe1a::33 2a01:111:f400:fe1b::33 2a01:111:f400:fe1e::33 2a01:111:f400:fe1f::33 2a01:111:f400:fe59::33 2a01:111:f400:fe5a::33 2a01:111:f400:fe5b::33
They appear to still be listening, though I didn't actually attempt a complete message. -- Alex Brotman Sr. Engineer, Anti-Abuse & Messaging Policy Comcast > -----Original Message----- > From: mailop <mailop-boun...@mailop.org> On Behalf Of ml+mailop--- via > mailop > Sent: Friday, October 28, 2022 12:38 AM > To: mailop@mailop.org > Cc: ml+mai...@esmtp.org > Subject: [EXTERNAL] Re: [mailop] Anyone else seeing email backed up to > Microsoft -- only IPv6 > > On Thu, Oct 27, 2022, Peter Beckman via mailop wrote: > > > Deferred: 451 4.7.500 Server busy. Please try again later from > > [2a01:111:e400:7e0d::51]. (AS750) > > Doesn't the MTA (which one do you use?) also try IPv4 or were there no A > records at all? > > Do you still have the results for the MX and A/AAAA lookups when the > problem happened? > > TIA. > -- > Please don't Cc: me, use only the list for replies. > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://urldefense.com/v3/__https://list.mailop.org/listinfo/mailop__;!!CQl > 3mcHX2A!EQ7oOilBjfPowU8f7W9Hp3zr96zg0Xxcbfy9fWtvpRkoesdVKfDrG99 > eZo3XWHXkaUzRjVJiWO-WBxmcv5I$ _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
