installing postfix mail on ubuntu 9.04 server

my task is to install a mail server on my ubuntu 9.04 server
i install postfix
  sudo apt-get install postfix
I configure postfix
  sudo dpkg-reconfigure postfix
in the file /etc/postfix/main.cf i have :

    myhostname = dogfish
    alias_maps = hash:/etc/aliases
    alias_database = hash:/etc/aliases
    myorigin = /etc/mailname
    mydestination = mail.mediasharks.org, localhost.localdomain, localhost
    relayhost =
    mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
    mailbox_size_limit = 0
    recipient_delimiter = +
    inet_interfaces = all
    home_mailbox = Maildir/
    smtpd_sasl_auth_enable = yes
    smtpd_sasl_type = dovecot
    smtpd_sasl_path = private/dovecot-auth
    smtpd_sasl_authenticated_header = yes
    smtpd_sasl_security_options = noanonymous
    smtpd_sasl_local_domain = $myhostname
my mail server hostname = mail.mediasharks.org
then i install
  sudo apt-get install dovecot-postfix

then i restarted the postfix
  sudo /etc/init.d/postfix restart
it was restarted successfully
my server pc name = dogfish ( not the mail name)
now i want to test
telnet dogfish 25
it gave me
       Trying 127.0.1.1...
       Connected to dogfish
       Escape character is '^]'.
       220 dogfish ESMTP Postfix (Ubuntu)
then i wrote
ehlo host
it gave me
250-dogfish
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN

but it didn't give me those two lines :
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN

does this mean that the test is not successfully ?
if so how can i solve it !

i will be glad if any one can help me