Mailinglistserver IPv6 address blacklisted

Aki Tuomi aki.tuomi at
Sun Nov 21 13:17:14 UTC 2021

I'll dig into this next week. Not sure at which point spamhaus opens a ticket about this.


On 20 November 2021 20.15.17 UTC, Arjen de Korte <build+dovecot at> wrote:
>It looks like the mailinglist server IPv6 address has been blacklisted:
>The 'Show details' shows the entire 2a04:3545:1000:720::/64 network is  
>blacklisted. Whois tells this is a network used by UpCloud Cloud  
>Servers. So either the mailinglistserver or a server it shares its  
>network with is compromised. If UpCloud gives its users their own /64,  
>it would probably be the former. Otherwise it might make sense to ask  
>them for one, as sharing IPv6 networks between customers is a no-no in  
>the IPv6 world.
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