Tried all kinds of user setup, and read what I found on different foras, but still get:

"Debug: open(/proc/self/io) failed: Permission denied"

Is anyone able to spot the misconfig?

Thanks in advance!

This is my dovecot -n:

# 2.3.7.2 (3c910f64b): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.7.2 () # OS: Linux 5.4.70-050470-generic x86_64 Ubuntu 20.04.6 LTS # Hostname: host auth_debug = yes auth_debug_passwords = yes auth_mechanisms = plain login auth_username_format = %Ln mail_location = maildir:~/Maildir mail_privileged_group = mail namespace inbox { inbox = yes location = mailbox Drafts { auto = create special_use = \Drafts } mailbox Junk { auto = create special_use = \Junk } mailbox Sent { auto = create special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = create special_use = \Trash } prefix = } passdb { driver = pam } protocols = imap pop3 lmtp imap lmtp pop3 service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } ssl = required ssl_cert = </etc/letsencrypt/live/mail.spijoing.com/fullchain.pem ssl_key = # hidden, use -P to show it ssl_min_protocol = TLSv1.2 ssl_prefer_server_ciphers = yes userdb { driver = passwd }