On Thu, 18 Jun 2020, Andreas Bueggeln - NOC - Profihost AG via mailop wrote:
Hello,
we host hundreds of dedicated servers on VMs and our customers send
thousands of mail to t-online.de mailboxes every day.
a new customer uses an ip, which has been offline for months or even
years wanted to send mails to t-online.de boxes.
the usual blacklisting happened, but now the helpdesk at t-online.de
refuses because of a new policy:
- the ptr to the server ip hast to resolve to the customer domain and
vice versa
- the mails are not allowed from a cloud vm host
- the web pages of the domain must have an correct imprint
the imprint on the domain is mandatory in germany and not the problem,
but our system use a generic server domain for the ptr and the smtp
connect. this cannot be changed and many VMs host several domains.
does anybody know how to solve this?
Would it be useful to give each (virtual ?) sending box a /64
and each domain have a separate IPv6 address within that space ?
Caveat: I believe that some big recipients are stricter
with mail from IPv6 addreses than IPv4 servers,
so if you do this you would need to do it right.
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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