When you create an e-mail account, CyberPanel creates without a problem. And when you add this account to Thunderbird, I can add without a problem and mails are coming. But when you send a mail from this account in Thunderbird, a message appears;
"Your message was sent but a copy was not placed in your sent folder due to network of file access errors"
The mail actually is sent but sent mail doesn't go to a Sent folder.
It seems like default Sent folder is not being created in CyberPanel, or Thunderbird cannot see IMAP folders correctly.
I deleted and re-installed mail account in Thunderbird and CyberPanel many times, no change.
How can I solve this?