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SMTP Error <<: 503 AUTH command used when not advertised

I have installed Exim4 however I face the tilted error in webmail lite.

Here is a snippet of my code info:

Code:

PLAIN:

  driver                    = plaintext

  server_set_id              = $auth2

  server_prompts            = :

  .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS

  server_advertise_condition = ${if eq{$tls_cipher}{}{}{*}}

  .endif 

  server_condition          = “${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{/etc/$domain/passwd}{$value}{*:*}}}}}{1}{0}}”

#  server_advertise_condition = ${if def:tls_cipher }

What am I missing ? How do I enable AUTH ?

Thanks in advance.

I believe your code may be initiating a standard SMTP connection instead of an extended SMTP connection (HELO vs EHLO), auth is not available in standard SMTP.

Any idea what SMTP connection Webmail Lite uses ? Standard or Extended ? How do I trace it ?

Thanks in advance.