Utilizing SMTP AUTH (5)
Fixed PLAIN

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

begin authenticators

fixed_plain:
  driver = plaintext
  public_name = PLAIN
  server_condition = 
    ${if and {{eq{$2}{username}}{eq{$3}{pwobscured}}}{yes}{no}}
  server_set_id = $2