Comments (1)
ewdurbin
commented on August 23, 2024
by default all firewall rules are applied to ipv4 and ipv6 addresses, so this is a postfix configuration issue apparently (since its not even listening on :::25.
it may have a reason as I recall as well, given the hosting platform (DigitalOcean) doesn't allow mail infra on ipv6 to prevent spam. last time I recall contacting them it was basically because of the large number of addresses they allocate per node leading to a proliferation of spammers using their infra.
I'll contact postmasters to see if they recall disabling ipv6 for postfix.
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