exim configure

acl_smtp_mail=acl_check_mail
acl_smtp_data=acl_check_data
begin acl
acl_check_mail:
  .ifdef CHECK_MAIL_HELO_ISSUED
  deny
    message = no HELO given before MAIL command
    condition = ${if def:sender_helo_name {no}{yes}}
  .endif

  accept

acl_check_data:
  accept

begin authenticators
fixed_cram:
  driver = cram_md5
  public_name = CRAM-MD5
  server_secret = ${if eq{$auth1}{ph10}{secret}fail}
  server_set_id = $auth1