I have noticed in the last few days that mail sent to gmail from a significant number of our servers (both shared hosting / mail relays and dedicated servers of our customers) with IPv6 connectivity is delivered to the spam folder. If there has been spamming activity (as a result of some security incident, I am not an ESP) from some of these servers then it is not recent. The reputation problem is tied to the IP address, because after adding a new one in the same /64 mail is delivered to the inbox.
(OTOH, recently I have received significant complaints from customers about gmail rejecting connections or delivering to the spam folder even long after a security incident, so this may be not specific to IPv6.) -- ciao, Marco
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