Unable to relay emails from postfix '530 5.7.57 SMTP; Client was not authenticated to send anonymous mail '

Issue

• The postfix fails to relay email due to authentication error '530 5.7.57 SMTP; Client was not authenticated to send anonymous mail'

  # tail -f /var/log/maillog
  Jan 27 17:21:05 node1.example.com postfix/smtp[33064]: 19B90C1C30DC: to=<username@domain.com>, relay=relay.example.com[x.x.x.x]:25, delay=5.1, delays=0.01/0.01/0.05/5, dsn=5.7.57, status=bounced (host relay.example.com[x.x.x.x] said: 530 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM (in reply to MAIL FROM command))
  Jan 27 17:21:05 node1.example.com  postfix/smtp[33064]: 19B90C1C30DC: lost connection with relay.example.com[x.x.x.x] while sending RCPT TO
  

• When sending email through telnet getting ' 504 5.7.4 Unrecognized authentication type '.

  # telnet x.x.x.x 25
  auth plain AHRlc3QAcmVkaGF0
  504 5.7.4 Unrecognized authentication type                                   ## Unrecognized authentication type
  451 4.7.0 Timeout waiting for client input
  Connection closed by foreign host.
  

• How to configure postfix to support NTLM authentication mechanism ?