On 2016-01-12 at 10:04 +0000 Tim Chown sent off: > We have fallen foul of senderbase's reputation, more than once, which oddly > keeps separate reputation for IPv4 and IPv6 transport for the same sending > system. Are you blocked for IPv4 for the same subnet?
it's for 2a01:4f8:192:486::/64 and of samba.org actually. IPv4 is fine but as just the SMTP layer disconnects with a permanent error there is no fallback to IPv4 at all. > https://www.senderbase.org/lookup/?search_string=sernet.de does show a 220% > rise in email volume the past 24 hours, but your rep seems fine, at least for > IPv4 as shown there. Also seems fine at spamhaus, though you don’t say which > specific sender you have issues with to look that up - might be interesting > to see what it says, whether or not Comcast use that particular system. our reputation is fine according to: https://www.senderbase.org/lookup/?search_string=lists.samba.org I suspect like with the KDE mailing list server, Comcast just applies stupid smtp policies to IPv6 addresses in order to "block spam", I haven't seen or read about this for IPv4 with Comcast before. Björn
