Jean-Francois Messier via linux wrote on 2025-12-21 10:44:
It's been known that VPS's hosted at OVH are on black lists.
I had an OVH VPS get a different IPv4 addr 2 weeks ago.
Immediately lost ability to send to Yahoo. And, Rogers.com because
Yahoo handles their backend.
Had to route such destinations through another VPS with no valid rDNS -
which surprisingly worked.
IP was not on any public RBL (except UCEProtect - thank you to whomever
posted links about that up-thread).
Finally contacted Yahoo and they removed it from their internal block
list within ~24 hours and it's all working now.
So, OVH IP, but only on an internal block list.
Yahoo, despite being notoriously picky about receiving email, allows IPs
with no rDNS.
Perhaps more surprisingly, Yahoo does not support IPv6 for email. Maybe
because avoiding block lists would be too easy? They ignored questions
about that.
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