are there any problems suspected when part of the
mailflow will be IPv6?
Djigzo will be sandwiched with IPv4 localhost but we are on the way to
configure Postfix for IPv6. So the question is if there is some internal
processing (mail header etc.) which is purely IPv4 or may choke on IPv6?
It should work but I have only briefly tested it with IPv6. The only
thing that might be problematic is sending email explicitly to an IPv6
address like for example: test@[0:0:0:0:0:0:0:1]. I'm not sure whether
Javamail, which is used by Djigzo, allows email addresses like that.
Djigzo open source email encryption