SASL PLAIN authentication failed: bad protocol / cancel

I try to configure postfix relay in kubernetes on Alpine using saslauthd.

Dockerfile:

FROM alpine:3.15

RUN apk update && \
    apk add --no-cache postfix \
      libsasl \
      cyrus-sasl \
      cyrus-sasl-login \
      cyrus-sasl-plain \
      openssl \
      shadow \
      ca-certificates \
      bash \
      rsyslog \
      supervisor && \
      /usr/bin/newaliases && \
      cp /etc/passwd /etc/passwd_orig && \
      # Clean up
      (rm "/tmp/"* 2>/dev/null || true) && (rm -rf /var/cache/apk/* 2>/dev/null || true)

EXPOSE 25

COPY ./configs/supervisord.conf /etc/supervisor/supervisord.conf

supervisord.conf:

[supervisord]
nodaemon=true
logfile=/var/log/supervisord.log
logfile_maxbytes=0

[program:rsyslog]
command=/usr/sbin/rsyslogd -n

[program:postfix]
command=/usr/libexec/postfix/master -c /etc/postfix -d

[program:saslauthd]
command=/usr/sbin/saslauthd -a shadow
startsecs=0

server config settings are:

cat /etc/default/saslauthd

MECHANISMS="shadow"

cat /etc/postfix/sasl/smtpd.conf

pwcheck_method: saslauthd
mech_list: PLAIN LOGIN

cat /etc/postfix/mail.cf

compatibility_level = 2
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
unknown_local_recipient_reject_code = 550
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
ddd $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /etc/postfix
readme_directory = /usr/share/doc/postfix/readme
inet_protocols = ipv4
meta_directory = /etc/postfix
shlib_directory = /usr/lib/postfix
biff = no
append_dot_mydomain = no
broken_sasl_auth_clients = yes
inet_interfaces = all
mailbox_size_limit = 0
mydestination = localhost
mydomain = example.com
myhostname = server.example.com
myorigin = server.example.com
relayhost = relayhostDNS
smtp_fallback_relay = relayhostDNS
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = lmdb:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

smtpd_recipient_restrictions =
  permit_mynetworks,
  permit_sasl_authenticated,
  check_relay_domains
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = server.example.com
cyrus_sasl_config_path = /etc/postfix/sasl
smtpd_sasl_path = smtpd
smtpd_sasl_security_options = noanonymous

cat /etc/postfix/sasl_passwd

relayhostDNS relayUser:relayPassword

After specify the base64-encoded form of \0username\0password I use telnet to check connect and authentification.

AUTH LOGIN authentification wokrs correctly but AUTH PLATN not. I got error from my telnet client:

535 5.7.8 Error: authentification failed: bad protocol / cancel

and next logs from server side:

2022-03-04T08:07:49.626134+00:00 mailrelay-0 postfix/smtpd[56]: warning: SASL authentication failure: Can only find author/en (no password) 2022-03-04T08:07:49.626159+00:00 mailrelay-0 postfix/smtpd[56]: warning: 10-244-20-10.openvpn.openvpn.svc.cluster.local[10.244.20.10]: SASL PLAIN authentication failed: bad protocol / cancel

Please could you tell me what the problem might be? Thank you.