Emails not reaching hotmail.

[joximu]

I think it's more or less a dns problem.

You should use full qualified hostnames which are resolveable and reverse lookup should also be ok.
Since you should not use a domain name in main.cf which is also a virtual domain I like this solution:
$mydomain and $myhostname set to your fqhn (host.domain.tld) and the hostname you give as URL for ispCP (admin.host.domain.tld).

And take care that the dns are setup correctly.

(I don't like the .local very much)