To bring this thread to conclusion, and request no further IETF list discussion: > On Aug 10, 2025, at 7:38 PM, Jeffrey Haas <jhaas@xxxxxxxx> wrote: > >> On Aug 10, 2025, at 2:11 PM, Jeffrey Haas <jhaas@xxxxxxxx> wrote: >> >> I self-host my e-mail. I realize that this immediately sets me up minimally as a particular kind of masochist. > > As some of the private response (and half the time, their tone) suggest... I am indeed a masochist. > > However, two useful details have been exchanged that at least clarify some possibilities: > > 1. It appears my IPv6 address for my new server instance has been swept up into a spamhaus PBL entry. This wasn't the case during initial setup and prior rounds of triage, but it'll certainly cause issues now. > It does appear that the PBL entries are a feature, not a bug. I have done a combination of mis-understand Hostinger's offerings (which are misleading in their web pages) which does NOT offer direct port 25 service, and the spamhaus PBL language about who the owner of the impacted address is. I am, after all, just a renter. :-) (Or was a renter. The service offering is inappropriate and I'll be finding someone else.) Thanks to the many folk who privately responded with helpful advice and suggestions for other providers. Thanks in particular to the saint-like patience of John Levine. -- Jeff