> May be I don't really get the idea behind virtual domains.

This might be a problem :)
 
> I understood it like this:
> I should have at least one real MX record in my DNS. 
> Now I can just make virtual domains by pointing (IN CNAME) to 
> the real server which has MX record.

No, every domain where you want to use smtp, you need a MX.

> ns.edu.haifa.ac.il was already created (but don't have it's 
> own MX, just CNAME to mail2.edu.haifa.ac.il )
> I've added mail2.edu.haifa.ac.il domain, and local delivery 
> (sending from/to these domains to themselves) is working now.

Local delivery is not the same as worldwide! You should read
some docs about DNS.
 
> I should make these changes to mydestination (as I understand 
> from Lucs' howto) to make things work.
> myhostname = mail2.edu.haifa.ac.il
> mydomain = edu.haifa.ac.il
> mydestination = $myhostname, localhost.$mydomain, 
> mail2.edu.haifa.ac.il, ns.edu.haifa.ac.il, 
> mysql:/etc/postfix/mysql-mydestination.cf

Please don't use domains in mydest and DB twice.

> Trying to send e-mail from [EMAIL PROTECTED] to 
> [EMAIL PROTECTED] I got this error:
> --------------------------------------------------
> Jul 25 15:16:14 ns postfix/smtpd[9333]: connect from 
> leon.edu.haifa.ac.il[212.74.41.34]
> Jul 25 15:16:14 ns postfix/smtpd[9333]: NOQUEUE: reject: RCPT 
> from leon.edu.haifa.ac.il[132.74.41.34]: 554 
> <[EMAIL PROTECTED]>: Relay access denied; 
> from=<[EMAIL PROTECTED]> to=<[EMAIL PROTECTED]> 
> proto=SMTP helo=<mainhutz>
> Jul 25 15:16:14 ns postfix/smtpd[9333]: disconnect from 
> leon.edu.haifa.ac.il[212.74.41.34]

Did you activate SMTP-AUTH on your client?

> A. Please explain to me the idea behind creation of virt. 
> domains and the steps to create them right (May be tell me 
> there my steps are wrong?)

You shouldn't use virt. domains without any knowledge about DNS.

> B. This server is my test server so I didn't make a change in 
> the production environment.

You're not an expert, so I would recommend, when changing 
such things to clear you DB tables and remove all users,
to you have a fresh setup.

> C. Any ideas on how to solve this problem?

Follow my hints :)


Michael
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