I have four mails in my queue that can't be send. Two diffrent error-messages.
The first one says:
Helo command rejected: Host not found (in reply to RCPT TO command)
This is what I find in the log for the same mail:
dane configured with dnssec lookups disabled
The second one says:
HELO fqdn needs a public DNS record OX_202
The log says pretty much the same:
*** refused to talk to me: 421 4.2.1 HELO fqdn needs a public DNS record OX_202
I changed my hostname and created the DNS Record.