many times spamassasin marks as SPAM emails sent between accounts of the same domain or between local hosted domains, so costumers start worrying about it... so what could we do?
just add the following line in /home/admispconfig/ispconfig/tools/spamassassin/etc/mail/spamassassin/local.cf file:
whitelist_from *@domain1.com *@domain2.net ...
and all the emails from this domains will not be mark as spam
thk u all