Hi Eric,

they told me they couldn't delist my IP because on the website unet.de was no legal information of the owner.

They need:
1. Servername indicating purpose of the server (mail.unet.de should be ok)
2. ip-address resolving to servername (ptr-record = mail.unet.de)
3. legalĀ  info about owner (fixed)

and then it takes time to get it on the whitelist.
The address to contact them is: postmas...@rx.t-online.de

I did the same for microsoft (outlook...)



Am 07.02.22 um 15:16 schrieb Eric Broch:
Did you contact rx.t-online.de ? I'd be interested in what they say.

On 2/7/2022 12:29 AM, Andreas Galatis wrote:
Hi,

when sending out mails to t-online I get the following message:

Connected to 194.25.134.8 but greeting failed.
Remote host said: 554 IP=85.10.201.91 - A problem occurred. (Ask your postmaster for help or to contactt...@rx.t-online.deĀ  to clarify.)

Does anybody have an idea?

Andreas


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