On 2022-10-20 09:10, Dominique Rousseau via mailop wrote:
Le Wed, Oct 19, 2022 at 01:33:04PM +0200, Heiko Schlittermann via
mailop [[email protected]] a écrit:
(...)
(translation by me):
Sorry, we only accept messages from proven
commercial or similiar servers. Please use the SMTP relay of your
hoster
or your ISP.
How is "proven" defined ?
Do they use a very strict whitelist ?
Or some other criteria ?
From what we're gathering here, a sine qua non is that the server
belongs to a commercial provider (as opposed to
private/personal/whatever), and this is —by their definition— based on
the presence of an impressum (or lack thereof) in the web site
associated with the e-mail domain (which is in itself a bit unclear, but
OK).
This is in section 4.1 of https://postmaster.t-online.de/, where you
also see that FcrDNS is a must, etc.
The whitelist seems to be managed by them (though surely they have some
pre-approved providers), and if you're not there you can, upon request,
get in the list.
Obviously this doesn't mean that anyone with an impressum can spam their
users at will (at least I hope so), so whatever further spam measures
they have will still apply.
The above is what I've understood from the available experiences
(including mine) and from the link quoted above.
Maybe a DT representative will speak up (if needed).
Cheers,
Bernardo
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