The input for each option is correct，but adding a mailbox failed.
@beta Check the Metabase log for more detailed errors.
Where can I find more detailed error logs for metabase?
In version 0.32, you can find logs and job tasks in Settings > Admin > Troubleshotting.
Depending on how you’re running Metabase, the actual log file might be located in the same directory as metabase.jar or maybe /var/log/metabase.log
I installed it through docker, how to find the directory of the log？
I faced same issue, its was issue with the firewall to the mail server…
Can you tell me how you solved it?
It cannot connect to host smtp.exmail.qq.com on port 25
When I try to telnet from my computer, then it also fails, so you need to check your firewall+DNS or contact your provider to make sure they’re not blocking you.