dovecot's XCLIENT implementation can't deal with IPv6
Hi,
When dovecot is used in "proxy" mode, any connection received from IPv6 will be sent without the mandatory "IPV6:" prefix, leading to postfix being confused and rejecting the connection.
The fix has been committed upstream over a year ago but is not in a release... https://github.com/dovecot/core/commit/88751f93d04816313f0fbcafe3a7fc018f5b9328
It would be great if the dovecot package could feature this trivial patch. We use it in Mailu (https://github.com/Mailu/Mailu/issues/2918).
Thanks!