Hi. what is the "access" field in the "mail_user" table? This field is not(?) saved/updated by ispconfig. I have not found anywhere that it was used by the isp panel. Most of the users have the value Y, but some of them have the value N. Mailboxes with the N value operate normally. I have 2 questions: 1. Where is this field used? 2. Why is the N value in any cases? I see that it can be entered using the API, but I have never used the API to update or add mailboxes.
If I remember correctly, the field is not used anymore, at least on dovecot setups. It was used in older ISPConfig versions and might still be used on courier installs though and has been replaced by the disable* fields.