I have, for some weeks now, running Postfix on opnsense. It was working perfectly with IPv4 and IPv6.
Now after the update to OPNsense 23.7.4, postfix IPv6 is not working. IPv4 is still good
I checked with https://www.hardenize.com (https://www.hardenize.com)
And there I saw the error with TLS. See attached picture.
Others using Postfix and ipv6 have the same errors? Or is there something changed with the update to 23.7.4 or something that broke my config wat was working perfectly before 23.7.4?
When I do the port forward to my mailsever directly instead of postfix, the mail is working. So it has something to do with postfix or opnsense(?)
Solved it: somehow my trusted network ipv6 was missing.