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Task #6762

open

Allow IPv6 only hosts to properly send emails to IPv4 only hosts

Added by Nico Schottelius over 5 years ago.

Status:
New
Priority:
High
Assignee:
Nico Schottelius
Target version:
-
Start date:
06/03/2019
Due date:
% Done:

0%

Estimated time:
PM Check date:

Description

Currently IPv6 only hosts get NAT64'ed to one of our IPv4 addresses. When there is a mail server running on an IPv6 only host that connects to an IPv4 host using the source address 185.203.114.1 .

This again is reverse DNS based mapped to 185-203-114-1.legacy.ipv4.at.ungleich.ch and usually does not fit the EHLO message of the mail server.

We need to find a nice fix for this problem short term so that people can run their mail server in IPv6 only networks

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