Dear Vodafone / Arcor.de Postmaster Team,
This is the email administrator of Korean Air.
We are currently experiencing delivery failures when sending emails to recipients using the arcor.de domain. We kindly request your assistance in identifying and resolving the issue.
Below are the IP addresses of our sending servers:
211.218.145.100
211.218.145.101
211.218.145.102
211.218.145.103
211.218.145.104
211.218.145.105
211.218.145.106
211.218.145.107
Additionally, we would like to share details of a recent sending attempt for your reference:
Recipient email: us2013@arcor.de
Sending time: 2025-06-04 00:05:15 (KST)
Error: mx_ip:2.207.151.53 connect error retry.. error [Connection reset]
We would greatly appreciate it if you could investigate this matter and provide feedback regarding the cause.
Thank you very much for your support.
Best regards,
