On Sun 10 Jul 2022, at 17:12, Gareth Evans <donotspam@fastmail.fm> wrote: > https://unix.stackexchange.com/questions/407663/ipv6-socket-creation-failed-address-family-not-supported-by-protocol FWIMBW, this explains how to disable ipv6 for exim4 (albeit on Deb 9) though I'm not sure the advice re hosts file is universally applicable.