When I send emails with my primary domain, my box (v60.1) seems to use its IPv4 address reliably. However, when I send with user@sudomain.mydomain.tld it uses its IPv6 address. It’s not a huge problem, but emails sent with the IPv6 address seem to be slightly more likely to go into spam folders, so I think I would prefer it if it were always the IPv4 address (unless there is a good reason for this that I don’t appreciate). Does anyone know the cause or solution for this? Thanks!