I have an SMTP 450 error on erias.eu even though everything was working fine before.
Even on OVH's Roundcube where the domain is hosted, it says it can't find either the domain or the username.
I tried a test with eee@erias.eu (which is a hard‑coded POP account).
I saw somewhere that I needed to reset the DNS zone. I did, but without success.
I found it in the meantime. Sorry. The domain was still active and “alive” in the OVH back‑office, but actually it was dead and not renewed by the person I wanted to help… 2020!
That domain on that account is actually dead.
Thanks for your insight