I found the problem: it cannot be a space after the "=" and "permit_mynetworks"
it must be "=permit_mynetworks"
but this was not the only problem, i had to create the file
Code:
/etc/postfix/sasl_passwd
and do
Code:
postmap /etc/postfix/sasl_passwd
so that sasl works properly.
so far everything seems to be working...