Hi, thank you for your answer. At the beginning we had a lot of issues with the ISP because of IPv6 public IPs and its following NAT issue. The variation of the ISPs and connection types are big. It is not always the same ISP. We had the issue at Telekom, Vodafone and some lokal ISPs also with different connection types like DSL, COAX(tv cable), hybrid(DSL and LTE combined) and FTTH. All the MX have a public IP-Address. Maybe I go along with the scripting part 🙂
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