hello @aaPanel_Kern i try to reinstall plugin and i create new user and try login again so i have some log you can see what happen
Jan 5 14:50:16 vps dovecot: imap-login: Login: user=dina@mydomai.co.id, method=PLAIN, rip=::1, lip=::1, mpid=19307, secured, session=<TK1CjX/xXOYAAAAAAAAAAAAAAAAAAAAB>
Jan 5 14:50:16 vps dovecot: imap(dina@mydomai.co.id): Error: Plugin 'imap_sieve' not found from directory /usr/lib/dovecot/modules
Jan 5 14:50:16 vps dovecot: imap(dina@mydomai.co.id): Error: Internal error occurred. Refer to server log for more information.
Jan 5 14:50:19 vps postfix/smtpd[19128]: connect from unknown[ip]
Jan 5 14:50:22 vps postfix/smtpd[19138]: warning: unknown[ip]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jan 5 14:50:22 vps postfix/smtpd[19138]: disconnect from unknown[ip] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Jan 5 14:50:27 vps dovecot: auth: Warning: auth client 0 disconnected with 1 pending requests: Connection reset by peer