When I login to webmail of any user account getting the following errors

Connection to storage server failed.
Server Error: AUTHENTICATE PLAIN: Authentication failed

tail /var/log/dovecot.log

Apr 12 17:39:56 imap(user@domain.tld)<7976><MQR4w5AygsJq2UlB>: Error: stat(/var/vmail/domain/user/tmp) failed: Permission denied (euid=1017(user) egid=12(mail) missing +x perm: /var/vmail/domain, dir owned by 101:12 mode=0700)

hi try to run this api fix

/scripts/cwp_api account mail_fix_permissions