Allow me to quote the description directly from Michael Weichselgartner in eSupport - "MEC-840-73087 Icewarp 184.108.40.206 IPv6 Issue"
Icewarp Mailserver tries all IPv6 MX records discovered for a domain
and then gives up. On for example Postfix on Linux the daemon tries to
connect to the first IPv6 address and at the moment it fails it
reconnects using IPv4.
As far as I know this fallback mechanism is not a must but highly
recommended. Please refer to
In my opinion Icewarp should support it.
In version 220.127.116.11 (Windows x64), it's still the same situation - IWS does not try IPv4 if first connection - IPv6 not working.
It's better to improve this soon.
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