* not sure I understand your question - the tracking center provides a view on the logs - it has no access to the mailsIs there any way to get emails back from the tracking center that are rejected?
If you read the information on how to use DNSBL's, they *ALL* state not to use public DNS servers to query their services. That's why you have a problem.This is a pity as the reason for the rejection is that zen.spamhaus.org was and still is unreachable (DNS failure). 1.1.1.1, 8.8.8.8 and my local ISP's DNS Server ALL say "Can't find zen.spamhaus.org: No answer" - When that happens then no mail can be delivered.
Thank you very much !! I went through that link you supplied and implemented the Unbound DNS solution as they suggested and it's working like a charm.If you read the information on how to use DNSBL's, they *ALL* state not to use public DNS servers to query their services. That's why you have a problem.
For further:
https://pmg.proxmox.com/wiki/index.php/DNS_server_on_Proxmox_Mail_Gateway