dovecot update from 2.1.16 to 2.2.36.4 but I have a trouble.

Hi,I have a troble and can not resolve it. Please help me.

I updated dovecot from 2.1.16 to 2.2.36.4. As a result, I had a client who could not access via imap. The client showed his logs (- folder not exists:INBOX ) I did not change dovecot config files.

So I searched a difference between 2.1.16 and 2.2.36.4, I discovered . Please refer below results.

[2.1.16] a03 list "" "*"

• LIST (\HasChildren) "." "INBOX"
• LIST (\HasNoChildren) "." "INBOX.Drafts"
• LIST (\HasNoChildren) "." "INBOX.Sent"
• LIST (\HasNoChildren) "." "INBOX.Spam"
• LIST (\HasNoChildren) "." "INBOX.Trash"

[2.2.36.4] a03 list "" "*"

• LIST (\HasChildren) "." INBOX
• LIST (\HasNoChildren) "." INBOX.Drafts
• LIST (\HasNoChildren) "." INBOX.Sent
• LIST (\HasNoChildren) "." INBOX.Spam
• LIST (\HasNoChildren) "." INBOX.Trash

For example, I noticed INBOX and "INBOX". 2.2.36.4 dovecot is no [""].

What should I do?