Authentication Setup and Virtual Users
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                     add authentication to your setup 
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                     install a sasl implementation (look at dovecot) - 
                              first use your already added local users 
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                              then bind your sasl authentication to your existing LDAP. (optional) 
 
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                     try again sending an email via your second host to a user on the first host using authentication 
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                     use an email client (MUA) like thunderbird for sending emails 
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                     add an fantasy domain (e.g. supertollermistudent.de) to your DNS Setup and let its mx record point to your mail server 
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                     add that domain to your mail setup 
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                     now configure email addresses within this domain - 
                              define these virtual email addresses in /etc/postfix/virtual
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                              configure a virtual email address pointing to your local user 
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                              configure a virtual email address pointing to your own HdM mail account. TipRead about postmap and set your local resolver (resolv.conf) to your own DNS 
 
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