Open JulienPalard opened 1 year ago
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.
mail.python.org
do have an IPv6 (and an IPv4):But it does not accept emails on its IPv6 interface: