How do you diagnose the queue?

[Andrei9385]

Hello. My mail is starting to get stuck. I don't see the problem in the logs. Where can I find the error why proxmox can't redirect mails to my Exchange server ?

mail.log - https://drive.google.com/file/d/1zBIQkfefeMwJl4cmNLILjQe6dM3T1TJB/view?usp=sharing